A–C, Percentage of PND14, PND21, PND28 and PND70 animals that displayed electrographic seizure activity following the administration of DFP (A), sarin (B) or VX (C). EA is defined as continuous epileptiform activity of ≥10 s but <5 min, and SE is defined as continuous rhythmic high-amplitude or sharp-wave activity for ≥ 5 min. D, n for electrographic seizure activity ((A–C)). E, percentage of animals with electrographic seizure activity ((A–C)). F. numbers of male and female animals in each age group that died or survived for 24 h following exposure to each agent.