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Circadian rhythmicity is not ubiquitous in the brain. Brain areas of diencephalic origin, such as the VOLT, VLPO, and PVN, showed damped circadian rhythmicity for one to four cyclesin vitro, whereas most others did not (e.g., VTA, DR, SN, PC, and CP). The OB was the only telencephalic structure tested that showed circadian rhythmicity.
