Abstract
Exposure to bright light (2000 lx) for 2 h at the beginning of a 12 h light period (10 lx) resulted in about 1 h advances in the onset and termination of N-acetylserotonin (NAc5HT) synthesis in the pineal gland of NZBWF1 strain mice compared with those in mice not exposed to bright light. These effects are in contrast with the effect of exposure to bright light throughout the light period, which delayed the onset of pineal NAc5HT synthesis in NZB mice. The possible relationship of these effects with the mechanism of action of phototherapy of human affective disorder is discussed.
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