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Daily cycle of mRNA expression for cell cycle regulators in adult zebrafish brain. Shown is transcript expression for cyclin A2 (A), p20 (B), cyclin B2 (C), and cyclin D1 (D). *p < 0.05 relative to the time of trough for mRNA abundance for each gene (ZT3′ for cyclin A2, p20, cyclin B2, and ZT19 for cyclin D1). n = 5–6 fish per time point; mean ± SEM. The gray background indicates night, 14:10 LD cycle. ZT of sample collection, ZT0 is lights-on time.
