PVALB and epilepsy: Next, we examined whether the Non-Principal cells infected with AAV-SmonCeiT were GABAergic based on colocalization of SmonCeiT with the neuropeptide parvalbumin (Parv), as Parv-expressing hippocampal interneurons are known to be GABAergic and have been implicated as a vulnerable cell population in other rodent epilepsy models [21].