mtON-expressing animals in a complex I mutant background (gas-1) were scored for locomotion speed in the presence of food by counting body bends per minute. mtON activation rescued the decreased locomotion of the gas-1 mutant background, one-way ANOVA with Tukey's post hoc test, -ATR, +light vs. +ATR, +light *p = 0.0145, +ATR, +light vs. wildtype (WT) *p = 0.0008 (-ATR, -light vs +ATR, +light p = 0.0272, +ATR, -light vs. +ATR, +light p = 0.0332, all conditions vs WT, p < 0.001, n = 30, 30,30,41,41 animals each bar from left to right). Data show mean ± standard deviation. 