Role of vasopressin in the medial preoptic area in the estradiol-induced luteinizing hormone and prolactin surgeControl of the estradiol-induced prolactin surge by the suprachiasmatic nucleusSCN outputs and the hypothalamic balance of life.Melatonin sees the light: blocking GABA-ergic transmission in the paraventricular nucleus induces daytime secretion of melatoninCentral vasopressin systems and steroid hormones