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Fig. 1. Behavioral red cone sensitivity at different times in the day and night in
zebrafish that were kept in LD and 2 days in DD. In both LD and DD, red cone
sensitivity increased during the day and decreased at night. Horizontal bars
at the top of the figure indicate lighting conditions; white bar, day; black
bars, night; gray bars, subjective days without light. Data represent the mean
± S.E.M. (N=8).