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No evidence for a diurnal vasoactive intestinal polypeptide (VIP) rhythm in the human suprachiasmatic nucleus
No daily rhythm of the blood vessel-regulating peptide VIP in the human body clock center
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Abstract
No significant diurnal variations were found in the volume of the vasoactive intestinal polypeptide (VIP) subdivision of the suprachiasmatic nucleus (SCN) in humans.
- The suprachiasmatic nucleus (SCN) is involved in regulating circadian rhythms in mammals.
- Photic information from the light-dark cycle may synchronize the SCN's endogenous clock.
- The study focused on the diurnal profile of VIP-producing neurons in the human SCN.
- In contrast to VIP-producing neurons, vasopressin-producing neurons in the SCN show a distinct diurnal rhythm.
- Vasopressin expression in the human SCN varies, with lower levels at night and peaks in the early morning.
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