egl-10 is involved in avoidance of aversive stimuli. N2 is the wild-type control, and egl-10 is egl-10(md176). For each genetic background, ≥50 animals were tested in at least three independent assays: in (a) and (b), each animal was subjected to three trials; in (c), each animal was subjected to 30 trials. The avoidance index is the number of positive responses divided by the total number of trials. In (B), avoidance is expressed as the time in seconds that the animal took to respond. In all panels, each bar represents the mean ± SEM. *Difference from N2, P < 0.01.