Selective Silencing of Hippocampal Parvalbumin Interneurons Induces Development of Recurrent Spontaneous Limbic Seizures in Mice

Drexel, Romanov, Wood, Weger, Heilbronn, Wulff, Tasan, Harkany · The Journal of Neuroscience · 2017 · neuroscience · 10.1523/jneurosci.3456-16.2017 · record Drexel2017-selective-silencing-of-hippocampal-parvalbum
tag layer · index · concepts · authors · עברית
Where this record's text came from. faceted 2026-08 by reading the locally held text (html); every evidence string verified as an exact substring of that text before merging. The study combines chronic telemetric EEG with video monitoring, slice patch-clamp, chemogenetics (DREADD/CNO) and immunohistochemistry; electrophysiology covers both the EEG and the patch-clamp evidence but the vocabulary cannot express the chemogenetic and histological arms. The DREADD arm is a within-paper null result (transient silencing induced neither acute nor recurrent seizures), but it serves the paper's mechanism claim rather than standing as its own contribution, so claim type is mechanism. The 'replicates' relation is the paper's statement that its own surprising negative synaptic finding matches Murray et al. (2011), not a deliberate replication attempt. 2026-08-13, 2026-08-14 and 2026-08-15 schema-0.3 passes: every quote verified as an exact substring of the staged text and anchored at merge time; concept terms verified present; every edge endpoint an existing node.
How to read this page. The article itself is not reproduced here — this paper is not cleared for redistribution, so what follows is the tag layer alone. The evidence sentences are withheld with the article. The table at the foot lists every tag the record carries; each row names the facet it belongs to, and the whose words column says whether the tag records the paper's own wording or the tagger's sentence about the paper. Every tag links to each other paper in the corpus carrying it. The machine-readable edition of the same thing is the TEI file beside this one, where the tags live in standOff, and the article is at its publisher via the link below. When we have changed our mind. Some entries in the table begin with a word in capitals and the reason for it. EVIDENCE CORRECTED — the finding still stands, but we had quoted the wrong sentence from the paper, and the quotation has been replaced with the right one. RETRACTED — the entry itself was wrong; it stays on the page, marked, with the reason, rather than being deleted. WITHDRAWN AND REPLACED — the entry was wrong, and a corrected version of it appears in the entries below. Each mark carries its own reason, in brackets, because the reasons differ from one entry to the next. An entry we have WITHDRAWN is removed from this page and kept in the record, with its reason. A line reading Audit and a date is a later re-reading of the entry against its whole sentence: DOUBTFUL means it was kept, and the reason says what is loose about it. Quotation marks inside the tagger's sentence. Where a tag is the tagger's own sentence, a phrase in quotation marks inside it is borrowed from the paper — the tagger's wording around it is not. The paper's own sentence is the evidence quote for that row; on this page it is withheld with the article, and the article is at its publisher. Nothing inside quotation marks anywhere on this page is ours: if it is quoted, it is the paper's. Whose words a concept carries. A concept entry records a term the paper itself uses, so the term, the sense given for it, and its evidence are the paper's own words, quoted where the paper fixes them. This is the opposite of a sense entry in the tag table, which is the tagger's sentence about how the paper uses a term. Where a concept entry could not be grounded in the paper's words, the entry says so on its own row.
Other fields define these differently the same word, defined another way in another discipline
specificity 8 fields · EEG 4 fields · threshold 2 fields · statistical-significance 2 fields · frequency 2 fields

Tags on this paper

Every tag the record carries, each linking to every other paper in the corpus that carries it. A tag appears here whether or not its words occur in the article — the spans below are only the ones a sentence in this paper licenses. Of the 32 concept tags on this paper, 4 are grounded in a quoted sentence. All carry the tagger's gloss of what the term means in this paper, which is not something the article can license.
PV parvalbumin interneuron GABA subiculum seizure epilepsy TeLC DREADD silencing inhibition transient permanent threshold PTZ basket cell somatostatin pyramidal eIPSC neurodegeneration vector specificity hippocampus EEG CNO feedforward dendritic axo-axonic challenge kindling frequency expression sustained loss of perisomatic feedforward inhibition from parvalbumin basket cells lowers the seizure threshold of subicular pyramidal cells, which then generates spike-wave clusters and spontaneous seizures compensatory readaptation of the disturbed circuit (e.g. sprouting of inhibitory terminals) gradually damps the seizure rate after several weeks C-SWDs DREADD (designer receptors exclusively activated by designer drugs) tetanus toxin light chain seizure threshold GFP vector Fisher's exact test Kruskal-Wallis test Kruskal–Wallis test with Dunn's multiple-comparison post hoc test ANOVA Two-way repeated-measures ANOVA t-test unpaired Student's t test statistical-significance standard error of the mean mean ± SEM Kruskal–Wallis test electrophysiology

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second readingalternativesan independent re-reading of a facet, recorded whether or not it agrees
relation to other workclaim_relationshow this paper stands to another: agrees, contradicts, extends, qualifies
claim typeclaim_typethe shape of the claim: existence, mechanism, method, critique, prediction, null
concept edgeconcept_edgesan asserted relation between two concepts, with the sentence asserting it
conceptconceptsan idea the paper works with, quoted where the paper uses it
content tagcontent_tagsa finding, definition, quantity, statistic or variable named in the paper
contributioncontributionwhat the paper claims to add
controlcontrolsan experiment run to eliminate a rival explanation
limitationlimitationswhat the paper says its evidence cannot support
mechanismmechanismshow the reported effect is said to come about
methodmethodhow the paper produced its evidence
object of studyobject_of_studywhat the paper is about — the thing it investigates
phenomenonphenomenonthe effect or regularity under study
research questionresearch_questionthe question the paper sets itself
sensesensesa distinct use of a term, quoted where the paper fixes it
transfertransfersa method or concept carried in from another field

The paper

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Every tag on this page

alternatives 3 · claim_relations 9 · claim_type 1 · concept_edges 15 · concepts 4 · content_tags 67 · contribution 1 · controls 6 · limitations 8 · mechanisms 6 · method 1 · object_of_study 1 · phenomenon 1 · research_question 1 · senses 18 · transfers 4

Relations on this page carry a quotation for the claim. Where a relation was separately evidenced — and so tested against the vocabulary for its type — the row says so; none of 15 relations here carry that mark. The rest are the tagger’s reading of the sentence quoted beside them.

facettagfieldconf.whose words
object_of_studywhether losing GABA release from parvalbumin interneurons in the ventral subiculum is by itself enough to produce temporal lobe epilepsy
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object_of_studythe paper's words
research_questionwhether a correlation seen in patients and models - selective loss of these cells - is causal, and whether the effect needs the silencing to be permanent
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research_questionthe paper's words
contributionpermanent silencing produces spontaneous recurrent seizures with no neurodegeneration, while transient silencing of the same cells produces nothing unless an excitatory challenge is added
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contributionthe paper's words
claim_typemechanism
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claim_typethe paper's words
phenomenontemporal lobe epileptogenesis
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phenomenonthe paper's words
methodelectrophysiology
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methodthe paper's words
mechanismsmechanisms
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[0]the tagger's words
mechanismsmechanisms
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mechanisms[1]the tagger's words
mechanismstetanus toxin light chain cleaves synaptobrevin, so GABA release is permanently gone from the transduced cells while the cells themselves survive
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mechanisms[2]1.0the tagger's words
mechanismsand the resulting loss of perisomatic feedforward inhibition lowers the seizure threshold enough that a subconvulsive dose precipitates convulsions and then lasting epilepsy
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mechanisms[3]1.0the tagger's words
mechanismsthese cells are described as crucial during excitatory challenge and transiently dispensable under basal conditions, which is why a short silencing does nothing on its own
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mechanisms[4]1.0the tagger's words
mechanismswith the later decline in seizure frequency attributed to unknown readaptation - inhibitory sprouting, reduced cannabinoid signaling, or compensation by untransduced cells
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mechanisms[5]0.8the tagger's words
limitationsVector expression was not confined to the subiculum, so silenced PV neurons elsewhere in the hippocampus may have contributed.
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what this limits: the attribution of the effect to subicular PV neurons: WE CANNOT EXCLUDE A CONTRIBUTION OF PV NEURONS SILENCED TO SOME EXTENT ALSO IN OTHER HIPPOCAMPAL SUBFIELDS
limitations[0]the tagger's words
limitationsThe absence of any change in overall evoked or miniature postsynaptic currents after silencing is unexplained.
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what this limits: the absence of change in evoked or miniature postsynaptic currents after silencing: THERE IS NO CLEAR EXPLANATION FOR THIS
limitations[1]the tagger's words
limitationsWhy seizure frequency declines after about five weeks is not known.
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what this limits: the decline in seizure frequency after about five weeks: THE UNDERLYING MECHANISMS ARE UNCLEAR
limitations[2]the tagger's words
limitationsThe seizure frequency the model produces is modest in absolute terms - roughly one to two per week - but still ABOVE the range most patients with temporal lobe epilepsy experience.
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what this limits: the model's relevance to patients: THE FREQUENCY OF SRSs IS MODEST (APPROXIMATELY ONE TO TWO PER WEEK) BUT STILL BEYOND THE RANGE OF SEIZURE FREQUENCY IN MOST TLE PATIENTS · note: claim corrected 2026-08-20 by the project. The previous text read 'The seizure frequency obtained is low relative to most patients with temporal lobe epilepsy.', which REVERSES its own quote: the paper says the rate is modest 'BUT STILL BEYOND the range of seizure frequency in most TLE…'. limitations[6], grounded on the same sentence, already read it correctly, and the disagreement between the two is what exposed it. The quote, the anchor and the scope are unchanged.
limitations[3]the tagger's words
limitationsthe vector reached about 61% of parvalbumin cells and spilled beyond the subiculum, so a contribution from other subfields cannot be excluded
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what this limits: the anatomical specificity of the manipulation: THE INJECTIONS WERE NOT EXCLUSIVELY RESTRICTED TO THE SUBICULUM, BUT OFTEN ALSO AFFECTED SOME PV-CONTAINING INTERNEURONS IN SECTOR CA1 AND THE PRESUBICULUM AND PARASUBICULUM
limitations[4]1.0the tagger's words
limitationsthe standard synaptic measures showed nothing, and the paper says there is no clear explanation for that
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what this limits: the mechanistic account of the behavioural effect: DESPITE THE SIGNIFICANT EFFECTS OF VECTOR INJECTIONS ON THE BEHAVIOR OF THE ANIMALS, NEITHER OVERALL eIPSCs OR EVOKED EPSCs NOR mIPSCs OR mEPSCs WERE AFFECTED IN SUBICULAR PYRAMIDAL CELLS
limitations[5]1.0the tagger's words
limitationsthe seizure frequency the model produces is above what most patients with this epilepsy experience
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duplicate of: limitations[3] · what this limits: the same scope as limitations[3] - the seizure rate is above the clinical range
limitations[6]1.0the tagger's words
limitationsthe frequency of SRSs appeared to decline after several weeks, the underlying mechanisms are unclear, and one may consider a variety of mechanisms responsible for this
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what this limits: the time course of the effect: THE FREQUENCY OF SRSs APPEARED TO DECLINE AFTER SEVERAL WEEKS. THE UNDERLYING MECHANISMS ARE UNCLEAR
limitations[7]1.0the tagger's words
transfersa Cre-dependent viral construct carrying tetanus toxin light chain, used to make a silencing permanent rather than reversible
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transfers[0]1.0the tagger's words
transfersthe designer-receptor system, imported specifically to supply the SHORT time course the toxin cannot give
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transfers[1]1.0the tagger's words
transfersa CB1 agonist used not as a treatment but as a subtraction, to remove one inhibitory source so the other becomes visible
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transfers[2]1.0the tagger's words
transfersthe observation that these cells are preferentially lost in patients, which is the correlation the whole experiment tries to convert into a cause
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transfers[3]1.0the tagger's words
controlsa matched GFP vector injected the same way, monitored for the same 6 to 8 weeks
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eliminates: the injection of a vector as the cause - none of the AAV-GFP-injected mice exhibited C-SWDs or SRSs during the 6-8 week recording period · outcome: held
controls[0]1.0the tagger's words
controlsthe transient-silencing drug given together with a threshold dose of the convulsant, in a separate group
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eliminates: the reading that the transient manipulation simply failed to reduce GABA release - the null is a null about DURATION, not about whether anything happened · outcome (stated by the tagger, no quotation): held
controls[1]1.0the tagger's words
controlsthe same threshold-dose challenge given 10 days after injection, to mice with only a few discharges and no seizures
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eliminates: kindling by repeated discharges as the source of the lowered threshold, since the threshold is already down before the discharges accumulate · outcome (stated by the tagger, no quotation): held
controls[2]1.0the tagger's words
controlsa cannabinoid agonist applied to suppress release from the OTHER basket cell population before measuring
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eliminates: the apparent absence of any synaptic effect - the manipulation is invisible until the competing inhibitory source is removed · outcome (stated by the tagger, no quotation): held
controls[3]1.0the tagger's words
controlsdouble labeling of 2724 transduced neurons against GABA, parvalbumin and somatostatin in 25 mice
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eliminates: silencing of the wrong cell class as the explanation - though it also shows the classes overlap · outcome (stated by the tagger, no quotation): partial
controls[4]1.0the tagger's words
controlsan activity marker counted across the hippocampal formation and neighbouring cortices
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eliminates: the possibility that the recorded events were local EEG artefacts rather than propagating seizures · outcome (stated by the tagger, no quotation): held
controls[5]0.9the tagger's words
conceptsGABA
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also in: GABA
concepts[3]the paper's words
conceptstransient
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also in: transient
concepts[11]the paper's words
conceptsthreshold
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also in: threshold
concepts[13]the paper's words
conceptsCNO
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also in: CNO
concepts[24]the paper's words
sensesTHE DURATION OF THE MANIPULATION IS THE VARIABLE, NOT ITS TARGET: permanent silencing of these cells produces recurrent seizures, and TRANSIENT inhibition OF THE SAME CELLS IN THE SAME PLACE lowers the threshold but induces neither acute nor recurrent seizures
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senses[0]1.0the tagger's words
sensesstated again as the conclusion - ONLY SUSTAINED, BUT NOT TRANSIENT, inhibition of GABA release is capable of inducing seizures or epilepsy
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senses[1]1.0the tagger's words
sensesAND THE NULL IS A NULL ONLY WITHOUT A PROBE: transient inhibition combined with a threshold dose of the convulsant produced discharges and acute seizures within two hours - these cells are CRUCIAL PROTECTORS DURING EXCITATORY CHALLENGE while TRANSIENTLY DISPENSABLE UNDER BASAL CONDITIONS
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senses[2]1.0the tagger's words
senseswith the control that makes the null readable at all - a separate group shows the drug DID impair GABA release, so the absence of seizures is about duration and not about whether the manipulation worked
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senses[3]1.0the tagger's words
sensesTHE STANDARD MEASURES ARE BLIND TO THE MANIPULATION AND THE PAPER SAYS SO: neither evoked nor miniature currents were affected despite the behavioral effect - THERE IS NO CLEAR EXPLANATION FOR THIS
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senses[4]1.0the tagger's words
sensesand the effect only appears once a competing source is pharmacologically removed - suppressing release from the OTHER basket cell population unmasks a reduction that the unsubtracted measure cannot see
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senses[5]1.0the tagger's words
sensesmeasured as a difference of two subtractions - 33% reduction in controls against 59% in treated animals, where the raw amplitudes did not differ at all
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senses[6]1.0the tagger's words
sensesA SELECTIVITY CLAIM WITH ITS OWN NUMBERS: 95.7% of transduced cells contained GABA, 83.2% parvalbumin and 23.7% somatostatin, from 2724 cells in 25 mice
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senses[7]1.0the tagger's words
sensesAND THE CATEGORIES OVERLAP, SO THE SELECTIVE MANIPULATION IS NOT SELECTIVE TO ONE FUNCTION: 15 to 30% of parvalbumin neurons ALSO contain somatostatin, and those cells - a different circuit motif - WERE THEREFORE ALSO AFFECTED
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senses[8]1.0the tagger's words
senseswith the anatomical leak declared too - the injections were not exclusively restricted to the target, and a contribution from other subfields CANNOT BE EXCLUDED
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senses[9]1.0the tagger's words
sensesand the coverage stated as a fraction rather than as success - 61.4% of parvalbumin interneurons at the injection site
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senses[10]1.0the tagger's words
sensesA LATENT STATE REVEALED BY A PROBE: mice with discharges but no seizures were already primed, and a threshold dose converted every one of them - and they then had recurrent seizures for the following two weeks
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senses[11]1.0the tagger's words
sensesAND A RIVAL EXPLANATION ELIMINATED BY MOVING THE PROBE EARLIER IN TIME: challenging at 10 days, before discharges could accumulate, shows the lowered threshold is not kindling by repeated discharges
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senses[12]1.0the tagger's words
sensesEPILEPSY WITHOUT CELL LOSS, WHICH IS WHAT MAKES IT A MODEL OF THE NONLESIONAL CASE: recurrent seizures develop NOTABLY WITHOUT SIGNS OF NEURODEGENERATION
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senses[13]1.0the tagger's words
sensesTHE EFFECT FADES AND NOBODY KNOWS WHY: the seizure frequency declines after several weeks, THE UNDERLYING MECHANISMS ARE UNCLEAR, and five candidate mechanisms are listed with none tested
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senses[14]1.0the tagger's words
sensesand the model is declared out of range of the disease it models - the seizure frequency is BEYOND THE RANGE of most patients with this epilepsy
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senses[15]1.0the tagger's words
sensesAN INHIBITORY CELL CLASS THAT MAY BE EXCITATORY: axo-axonic cells, silenced along with the rest, MAY ALSO EXERT AN EXCITATORY FUNCTION through a locally reversed chloride gradient
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senses[16]1.0the tagger's words
senseswith the competing account of the same disease quoted in full - a deficit in DENDRITIC feedback inhibition lowers the threshold, while augmented SOMATIC feedforward inhibition limits epileptiform activity
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senses[17]1.0the tagger's words
alternativesclaim_type: mechanism
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a second reading reaching the same value. Recorded: mechanism — note: a second reading reaching the same value from a different sentence. Not applied - a person decides.
alternatives.claim_typethe tagger's words
alternativesmethod: two silencing tools with different time courses applied to the same cells in the same place, so that duration is the manipulated variable
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a second reading DIFFERING from the recorded value. Recorded: electrophysiology — note: a second reading, verbatim-verified, disagreeing with the value on the record. Not applied - a person decides.
alternatives.methodthe tagger's words
alternativesphenomenon: temporal lobe epilepsy developing over a silent phase after an initial insult, with the mechanism of the transition poorly understood
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a second reading DIFFERING from the recorded value. Recorded: temporal lobe epileptogenesis — note: a second reading, verbatim-verified, disagreeing with the value on the record. Not applied - a person decides.
alternatives.phenomenonthe tagger's words
claim_relationsbuilds-on → Andrioli et al. (2007), Knopp et al. (2008) and Drexel et al. (2011), reporting selective loss of subicular PV interneurons in TLE patients and animal models
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claim_relations[0]the tagger's words
claim_relationsextends → Cammarota et al. (2013), Lee et al. (2014) and Toyoda et al. (2015) on the protective role of fast-spiking PV basket cells at seizure onset
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claim_relations[1]the tagger's words
claim_relationsreplicates → Murray et al. (2011)
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claim_relations[2]the tagger's words
claim_relationssupports → the causal role of parvalbumin interneuron loss in the subiculum in the development of temporal lobe epilepsy
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differs in: Quotation withheld
claim_relations[3]1.0the tagger's words
claim_relationsqualifies → the reading that silencing these interneurons causes seizures - it does so only if the silencing is sustained
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differs in: only irreversible silencing of PV neurons by TeLC expression, but not a transient inhibition
claim_relations[4]1.0the tagger's words
claim_relationscontradicts → the requirement that epilepsy in this model be accompanied by neurodegeneration
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claim_relations[5]1.0the tagger's words
claim_relationsdistinguishes-from → kindling by accumulated discharges as the source of the lowered seizure threshold
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differs in: THE AXIS IS WHICH CAUSE PRODUCED THE THRESHOLD DROP. 'Quotation withheld.' The manipulation and its own downstream consequence are confounded by design - the silencing produces the discharges, and the discharges could produce the threshold change - so the paper names the loop before testing it.
claim_relations[6]1.0the tagger's words
claim_relationscritiques → its own synaptic measurements, which showed no effect and are left without a clear explanation
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differs in: THE AXIS IS WHICH LEVEL THE EFFECT APPEARS AT. 'Despite the significant effects of vector injections on the behavior of the animals, neither overall eIPSCs or evoked EPSCs nor mIPSCs or mEPSCs were affected in subicular pyramidal cells ... This is rather surprising.' A behavioural effect with no matching synaptic effect, reported as unexplained - the paper declines to reconcile its own two levels and says so.
claim_relations[7]1.0the tagger's words
claim_relationssupports → the account in which both dendritic and perisomatic inhibition matter, rather than one alone
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claim_relations[8]0.9the tagger's words
concept_edgesPV —causes→ GABA
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strength of the relation: 1 · note: GABA release inhibited SELECTIVELY from PV neurons, permanently, by a viral tetanus toxin light chain Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the study inhibited GABA RELEASE FROM PV neurons; 'PV causes GABA' is loose.
also in: PV · GABA
concept_edges[0]1.0the tagger's words
concept_edgespermanent —contrasted-with→ transient
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strength of the relation: 1 · note: THE DURATION IS THE VARIABLE, NOT THE TARGET - transient inhibition of the SAME cells in the SAME place lowered the threshold but induced NEITHER acute NOR recurrent seizures
also in: permanent · transient
concept_edges[3]1.0the tagger's words
concept_edgestransient —causes→ threshold
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direction on the measure: reduces · strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span is cut before the threshold claim completes.
also in: transient · threshold
concept_edges[4]1.0the tagger's words
concept_edgesTeLC —contrasted-with→ DREADD
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differs in: THE AXIS IS PERMANENCE OF THE SILENCING, WITH THE TRANSIENT DURATION GIVEN. 'only irreversible silencing of PV neurons by TeLC expression, but not A TRANSIENT INHIBITION (FOR ~1 TO 2 H) through the DREADD system, results in C-SWDs or SRSs.' Both tools silence the same cells; the phenotype appears only for the irreversible one, so the result is about DURATION rather than about PV neurons - and a study using DREADDs would have found nothing and concluded differently. · strength of the relation: 1 · note: and the null turns positive with a probe - transient inhibition PLUS a threshold dose gave discharges and acute seizures, so these cells are CRUCIAL PROTECTORS DURING EXCITATORY CHALLENGE and TRANSIENTLY DISPENSABLE UNDER BASAL CONDITIONS
also in: TeLC · DREADD
concept_edges[8]1.0the tagger's words
concept_edgesCNO —causes→ GABA
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direction on the measure: reduces · strength of the relation: 1 · note: THE CONTROL THAT MAKES THE NULL READABLE - a separate group shows the drug DID impair GABA release, so the absence of seizures is about duration, not about whether anything happened
also in: CNO · GABA
concept_edges[10]1.0the tagger's words
concept_edgesPTZ —causes→ seizure
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its span and kept, but PTZ is the convulsant challenge; the span shown is about verifying inhibition.
also in: PTZ · seizure
concept_edges[11]1.0the tagger's words
concept_edgesbasket cell —causes→ eIPSC
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strength of the relation: 1 · note: the effect appears only once a COMPETING SOURCE is pharmacologically removed - suppressing release from the OTHER basket cell population unmasks a reduction the unsubtracted measure cannot see
also in: basket cell · eIPSC
concept_edges[14]1.0the tagger's words
concept_edgesTeLC —causes→ eIPSC
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1 · note: a difference of two subtractions - 33% reduction in controls against 59% in treated animals, where the raw amplitudes did not differ at all Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but TeLC-injected mice showed a larger WIN-induced eIPSC reduction (59% against 33%); causes is indirect and drops the comparison.
also in: TeLC · eIPSC
concept_edges[16]1.0the tagger's words
concept_edgesTeLC —causes→ EEG
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strength of the relation: 1 · note: 88% showed clustered discharges by day 16 and 64% at least one spontaneous seizure by day 28; NONE of the control-vector mice showed either Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but AAV-TeLC injection produced spike-wave discharges and seizures SEEN IN the EEG; 'causes EEG' is loose.
also in: TeLC · EEG
concept_edges[22]1.0the tagger's words
concept_edgesneurodegeneration —distinct-from→ epilepsy
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strength of the relation: 1 · note: EPILEPSY WITHOUT CELL LOSS, which is what makes it a model of the nonlesional case - NOTABLY WITHOUT SIGNS OF NEURODEGENERATION Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but epilepsy was induced 'notably WITHOUT signs of neurodegeneration'; distinct-from is loose.
concept_edges[23]1.0the tagger's words
concept_edgespermanent —causes→ seizure
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span says restricted inhibition induces recurrent discharges progressing to seizures; 'permanent' is a fragment endpoint.
also in: permanent · seizure
concept_edges[24]1.0the tagger's words
concept_edgesthreshold —operationalised-as→ PTZ
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strength of the relation: 1 · note: A LATENT STATE REVEALED BY A PROBE - a threshold dose converted every primed mouse, and they then had recurrent seizures for the following two weeks Audit 2026-09-28: DOUBTFUL - read against its span and kept, but PTZ was used to test seizure threshold; operationalised-as is loose.
also in: threshold · PTZ
concept_edges[25]1.0the tagger's words
concept_edgesbasket cell —causes→ pyramidal
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span says basket cells exert feedforward inhibition on pyramidal cells; causes 'pyramidal' drops 'inhibition'.
concept_edges[35]1.0the tagger's words
concept_edgesPV —part-of→ subiculum
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strength of the relation: 1 · note: the correlation the experiment tries to convert into a cause - PV interneurons preferentially lost in the subiculum of patients EVEN WITHOUT sclerosis Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span says PV interneurons are lost in the subiculum; part-of is loose.
also in: PV · subiculum
concept_edges[36]1.0the tagger's words
concept_edgespyramidal —part-of→ subiculum
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its span and kept, but pyramidal neurons of the subiculum; part-of is loose.
also in: pyramidal · subiculum
concept_edges[43]1.0the tagger's words
content_tagsFisher's exact test
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content_tags.statistics[0]the tagger's words
content_tagsKruskal-Wallis test
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content_tags.statistics[1]the tagger's words
content_tagsANOVA
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also in: ANOVA
content_tags.statistics[2]the tagger's words
content_tagst-test
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: t-test
content_tags.statistics[3]the tagger's words
content_tagsstatistical-significance
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content_tags.statistics[4]the tagger's words
content_tagsstandard error of the mean
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content_tags.statistics[5]the tagger's words
content_tagsTwo-way repeated-measures ANOVA
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content_tags.statistics[6]0.9the tagger's words
content_tagsKruskal–Wallis test
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.statistics[7]0.8the tagger's words
content_tagseighty-eight percent of the mice presented clusters of spike-wave discharges (C-SWDs) and 64% showed spontaneous recurrent seizures (SRSs)
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content_tags.findings[0]the tagger's words
content_tagsThe epilepsy developed without any detectable loss of parvalbumin or GABA neurons, i.e. without neurodegeneration.
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[1]the tagger's words
content_tagsTransient chemogenetic silencing of PV neurons for 1-2 h induced no discharge clusters or seizures over the following 5 days.
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content_tags.findings[2]the tagger's words
content_tagsInhibiting GABA release from subicular/CA1 PV interneurons is by itself sufficient to lower the seizure threshold.
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content_tags.findings[3]the tagger's words
content_tagsThe manipulation selectively cut the parvalbumin-mediated component of inhibition onto subicular pyramidal cells while leaving cholecystokinin-basket-cell inhibition intact.
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[4]the tagger's words
content_tagsSeizure frequency did not grow indefinitely but fell back after about five weeks.
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content_tags.findings[5]the tagger's words
content_tagsA PTZ dose provoked acute tonic-clonic seizures in all TeLC-injected mice but in only one of seven GFP controls and none of five wild-type mice.
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content_tags.findings[6]the tagger's words
content_tagsTHE DURATION OF THE MANIPULATION IS THE VARIABLE, NOT ITS TARGET: transient inhibition of the SAME cells in the SAME place lowered the seizure threshold but induced NEITHER acute NOR recurrent seizures
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content_tags.findings[7]1.0the tagger's words
content_tagsONLY SUSTAINED, BUT NOT TRANSIENT, inhibition of GABA release from these neurons is capable of inducing seizures or epilepsy
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content_tags.findings[8]1.0the tagger's words
content_tagsAND THE NULL IS A NULL ONLY WITHOUT A PROBE: transient inhibition plus a threshold dose gave discharges and acute seizures - these cells are crucial protectors during excitatory challenge and TRANSIENTLY DISPENSABLE under basal conditions
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content_tags.findings[9]1.0the tagger's words
content_tagswith the control that makes the null readable - a separate group shows the drug DID impair GABA release
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content_tags.findings[10]1.0the tagger's words
content_tagsTHE STANDARD MEASURES ARE BLIND TO THE MANIPULATION: neither evoked nor miniature currents were affected despite the behavioral effect, and THERE IS NO CLEAR EXPLANATION FOR THIS
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content_tags.findings[11]1.0the tagger's words
content_tagsand the effect appears only once a competing source is pharmacologically removed
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content_tags.findings[12]1.0the tagger's words
content_tagsmeasured as a difference of two subtractions - 33% reduction in controls against 59% in treated animals
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[13]1.0the tagger's words
content_tagsA SELECTIVITY CLAIM WITH ITS OWN NUMBERS: 95.7% of transduced cells contained GABA, 83.2% parvalbumin and 23.7% somatostatin, from 2724 cells in 25 mice
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content_tags.findings[14]1.0the tagger's words
content_tagsAND THE CATEGORIES OVERLAP: 15 to 30% of parvalbumin neurons also contain somatostatin, and those cells WERE THEREFORE ALSO AFFECTED
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content_tags.findings[15]1.0the tagger's words
content_tagswith the anatomical leak declared - the injections were not exclusively restricted to the target and a contribution from other subfields CANNOT BE EXCLUDED
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content_tags.findings[16]1.0the tagger's words
content_tagsand the coverage stated as a fraction rather than as success - 61.4% of parvalbumin interneurons at the injection site
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[17]1.0the tagger's words
content_tags22 of the 25 mice (88%) exhibited unprovoked C-SWDs, and NONE of the AAV-GFP-injected mice exhibited C-SWDs or SRSs during the 6-8 week recording period
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content_tags.findings[18]1.0the tagger's words
content_tagsEPILEPSY WITHOUT CELL LOSS: recurrent seizures develop NOTABLY WITHOUT SIGNS OF NEURODEGENERATION, which is what makes it a model of the nonlesional case
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[19]1.0the tagger's words
content_tagsA LATENT STATE REVEALED BY A PROBE: mice with discharges but no seizures were already primed, and a threshold dose converted every one of them
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content_tags.findings[20]1.0the tagger's words
content_tagsAND A RIVAL ELIMINATED BY MOVING THE PROBE EARLIER IN TIME: challenging at 10 days shows the lowered threshold is not kindling by accumulated discharges
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content_tags.findings[21]1.0the tagger's words
content_tagsseizure frequency declined after several weeks, the mechanisms are unclear, and several candidate explanations are listed
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content_tags.findings[22]1.0the tagger's words
content_tagsand the model is declared out of range of the disease it models - the seizure frequency is BEYOND THE RANGE of most patients
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content_tags.findings[23]1.0the tagger's words
content_tagsaxo-axonic cells may also exert an excitatory function through a locally reversed chloride gradient at their synapses
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[24]1.0the tagger's words
content_tagswith the competing account quoted in full - a deficit in DENDRITIC feedback inhibition lowers the threshold while augmented SOMATIC feedforward inhibition limits epileptiform activity
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
WHOSE RESULT THIS IS: Cossart et al. (2001) proposed - THE EVIDENCE FOR THIS ROW ATTRIBUTES THE WORK TO SOMEBODY ELSE. The cited name is the subject of a result verb and the sentence carries no first-person marker, so the finding, quantity or definition is the CITED author's rather than this record's. The claim is true and the quote is verbatim - what is wrong is whose result the corpus says it is. Nothing edited, nothing withdrawn: the row is marked so a page can name the source. Where the record is a commentary or review, its claim relations layer usually already names the paper being discussed - the record knows at one layer and forgets at another.
content_tags.findings[25]1.0the tagger's words
content_tagsthe transition from a normal to an epileptic brain takes years, and its cellular and molecular mechanisms are STILL POORLY UNDERSTOOD
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content_tags.findings[26]1.0the tagger's words
content_tagsΔFosB was only barely expressed in controls and in mice that exhibited only C-SWDs, and prominently labeled neurons in the hippocampus, subiculum, and entorhinal and perirhinal cortices after frequent SRSs
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[27]1.0the tagger's words
content_tagswith the human parallel stated - AS IN PATIENTS WITH NONLESIONAL TLE, these mice developed epilepsy without signs of neurodegeneration
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content_tags.findings[28]1.0the tagger's words
content_tagsand activating EITHER dendritic or perisomatic inhibition suppressed epileptiform activity, with all GABA neurons together more effective than either
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[29]1.0the tagger's words
content_tagsseizure
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: seizure
content_tags.definitions[0]the tagger's words
content_tagsC-SWDs
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also in: C-SWDs
content_tags.definitions[1]the tagger's words
content_tagsDREADD (designer receptors exclusively activated by designer drugs)
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.definitions[2]the tagger's words
content_tagstetanus toxin light chain
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.definitions[3]the tagger's words
content_tagsTeLC
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: TeLC
content_tags.definitions[4]1.0the tagger's words
content_tagsDREADD
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: DREADD
content_tags.definitions[5]1.0the tagger's words
content_tagsfeedforward
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: feedforward
content_tags.definitions[6]0.9the tagger's words
content_tagsthreshold
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: threshold
content_tags.definitions[7]0.9the tagger's words
content_tagsseizure threshold
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.variables[3]the tagger's words
content_tagsGFP vector
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: GFP vector
content_tags.variables[5]the tagger's words
content_tagsthreshold
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: threshold
content_tags.variables[6]1.0the tagger's words
content_tagsfrequency
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: frequency
content_tags.variables[7]1.0the tagger's words
content_tagsexpression
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: expression
content_tags.variables[8]1.0the tagger's words
content_tagstransient
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: transient
content_tags.variables[9]1.0the tagger's words
content_tags88% — proportion of vector-injected mice showing unprovoked clusters of spike-wave discharges by day 16
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[0]the tagger's words
content_tags64% — proportion of TeLC-injected mice that went on to develop spontaneous recurrent seizures
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[1]the tagger's words
content_tags61.4 ± 2.43% — fraction of parvalbumin interneurons at the injection site that expressed the silencing construct
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[2]the tagger's words
content_tags89.5% — share of spontaneous seizures that were immediately preceded by a preictal discharge cluster
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[3]the tagger's words
content_tags24.6 ± 0.62 s — average duration of a spontaneous recurrent seizure
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[4]the tagger's words
content_tags40.0 ± 9.07 per month/mouse — rate of discharge clusters per mouse per month
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[5]the tagger's words
content_tagsF (1,20) = 4.72, p = 0.0419 — group effect on the cannabinoid-insensitive (parvalbumin-mediated) component of the evoked IPSC
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[6]the tagger's words
content_tags33% / 59% — reduction of evoked IPSC amplitude by the CB1 agonist in control versus silenced mice
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content_tags.quantities[7]the tagger's words
content_tags∼73% — share of mice in which discharge clusters progressed to spontaneous recurrent seizures
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content_tags.quantities[8]the tagger's words
content_tagsp = 0.0047 — significance of the difference in acute pentylenetetrazole-induced convulsions between silenced mice and controls
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content_tags.quantities[9]the tagger's words
content_tags61.4 ± 2.43% — of the target cells actually reached by the vector - the manipulation's coverage stated as a fraction, so 'selective silencing' in the title means silencing three cells in five
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content_tags.quantities[10]1.0the tagger's words
content_tags95.7 ± 0.68%, 83.2 ± 1.27%, and 23.7 ± 1.61% — of transduced cells containing GABA, parvalbumin and somatostatin - the third number is the one that shows the target category is not one functional class
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content_tags.quantities[11]1.0the tagger's words
content_tags15–30% — of parvalbumin neurons that also contain somatostatin, so a manipulation aimed at one circuit motif necessarily hits another
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content_tags.quantities[12]1.0the tagger's words
content_tags33% ... 59% — the reduction in the amplitude of eIPSCs by WIN 55,212-2 in AAV-GFP-injected mice and in mice injected with AAV-TeLC
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content_tags.quantities[13]1.0the tagger's words
content_tagsone to two per week — the seizure frequency the model produces, stated as being ABOVE what most patients experience - a model's severity reported against its target rather than on its own
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content_tags.quantities[14]1.0the tagger's words

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© 2026 Shir Sivroni · ORCID 0009-0000-2597-2824