Fig. 2. Effects of a light pulse on the rapid eclosion response. Flies of the w¹¹¹⁸xUAS-rpr strain (A) received light continuously from the time of normal LOn, (B) were held in the dark or (C) received a 20 min pulse of light beginning at +1 h from normal LOn. Axes and coloring are as described for Fig. 1. Data bars give the means ± s.e.m. for four trials (N=993–1316 per test condition per trial).