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Circadian activity rhythms of gr+/+ and gr−/− adult zebrafish. Representative actograms (A,C) of adult zebrafish gr+/+ and gr−/− subjected to 12:12 LD cycles and then to LL. Activity records in the last 10 days of LD cycles (B and D) and of LL (E) were subjected to χ2 periodogram analysis. Dotted lines marked the splitting of the rhythm into two independent components with periodicity in the circadian range. For more details, see Figure 2 and Figure 5.
