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Circadian activity rhythms of gr+/+ and gr−/− larvae zebrafish. (A) Larvae were reared under light–dark (LD) cycle from 0 to 6 dpf and then maintained for 3 days in constant dim light (LL). Locomotor activity were recording from 24 to 60 h in LL. (B) Mean waveform of locomotor activity under LL for 36 h (n = 144/genotype).
