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Circadian oscillation of the PK2 mRNA levels in the SCN of rhesus macaque monkeys. Shown are in situ hybridization images of PK2 from monkey brains that were sacrificed at 3AM, 7AM, 11AM, 3PM, 7PM, and 11PM. The circadian oscillation of PK2 mRNA level is apparent. Scale bar, 1mm.
