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Circadian rhythms of vasopressin content in the suprachiasmatic nucleus of the rat
Daily patterns of vasopressin levels in the brain’s internal clock area of rats
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Abstract
Arginine-vasopressin (AVP) levels in the suprachiasmatic nucleus showed a circadian rhythm peaking during the early light phase.
- AVP exhibited a broad trough in levels during the dark phase under light-dark conditions.
- Circadian rhythmicity of AVP was maintained after 14 days in constant dark and 3 days in constant light.
- The patterns of AVP levels were similar to those of somatostatin, suggesting a shared regulatory mechanism for these peptides in the SCN.
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