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Fig. 1. Circadian rhythms of rhodopsin mRNA expression in isolated zebrafish
retinas in constant darkness (DD). Between the subjective day and night, the
expression of rhodopsin mRNA fluctuated. The expression increased steadily
during the day, peaked in the late afternoon and then decreased at night.
Horizontal bar: black indicates night; gray, subjective day without light.
Values are means ± s.e.m. (N=8 at each time point).