All OPs produced a rapid onset and recovery from the behavioral
effects. This was especially true with mevinphos, for which effects
started almost immediately and completely recovered by 45 min.
Unexpected lethality occurred only with the high dose of mevinphos
in PND17 rats. ChE inhibition data are presented in Figs. 1–4, and
motor activity in Fig. 5; point estimates from fitted curves are listed in
Table 1. In adult rats, there were little or no differential effects on
horizontal counts compared to vertical activity for any of the
chemicals tested (data not shown).