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Mammalian circadian activity rhythms are generated by pacemaker cells in the suprachiasmatic nucleus (SCN). As revealed by the actions of diverse agonists, serotonergic input from raphe nuclei generally inhibits photic signaling in the suprachiasmatic nucleus. In contrast, the serotonin (5HT) 1A partial agonist, 4-(benzodioxan-5-yl)1-(indan2-yl)piperazine (S 15535), was found to enhance the...
The midbrain-localized Edinger-Westphal nucleus is a major site of production of urocortin 1. Urocortin 1 is a neuropeptide related to corticotropin-releasing factor that has high affinity for corticotropin-releasing factor type-1 and corticotropin-releasing factor type-2 receptors. In several mouse models, the amount of urocortin 1 neurons within the Edinger-Westphal nucleus is positively associated...
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