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The suprachiasmatic nucleus (SCN) of the hypothalamus is involved in the generation and entrainment of circadian rhythms. The results of a series of experiments in long-term cultured organotypic SCN slices suggest that (1) some but not all SCN neurons display circadian rhythmicity in their extra-cellular discharges. To the extent they could be studied, these neurons did not usually show synchronized...
Continuous environmental illumination or constant light (LL) exposure causes a suppression of daily water intake, and long-term exposure of greater than 19 days produces a hypertrophy of magnocellular neuroendocrine cells (MNCs) in the hypothalamus. These findings led Glantz to hypothesize that LL increases the secretion of vasopressin (VP). We wanted to determine whether LL could trigger morphological...
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