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Time of maximal clock gene expression map for BMAL1, PER1 and 2 and REV‐ERB in the hippocampus (Hipp) and the cortex. Yellow panels indicate the light phase, and blue panels show the dark phase. ZT refers to Zeitgeber time, which literally means “provider of time” and refers to an environmental signal that indicates time, like the onset of light (ZT = 0)
