a, b, Actograms showing rhythmic and arrhythmic rh71,cry01 double mutants. The flies were entrained under 12-hr light/12-hr dark (L/D) cycles and subsequently released to constant darkness (D/D). c, Percentages of rhythmic and arrhythmic flies. Fisher’s exact test. **p<0.01. Number of flies tested: control, n=16; other genotypes, n=30. d–h Circadian behavior of gl60j and rh71,gl60j double mutant flies. The flies were entrained to 12-hr light/12 hr dark cycles (L/D) for 4 days and subsequently released to constant darkness (D/D). d, Percentages of rhythmic and arrhythmic flies. e–h, Average actograms showing the activities of flies of the indicated genotypes. Number of flies tested: control, n=46; rh71 n=34; gl60j n=38; rh71,gl60j, n=40. i, Phase response of the indicated genotypes to a 5-min white light stimulation at ZT22. The error bars indicate S.E.M.s. One-way ANOVA test (Kruskal-Wallis test) followed by the Dunn’s test. **p<0.01. Flies tested: control, n=54; rh71 n=49; gl60j n=53; rh71,gl60j, n=57.