Photoperiodic regulation of the estrous cycle of the rat: role of the pineal gland.
D000818:Animals; D004971:Estrus; D005260:Female; D007030:Hypothalamo-Hypophyseal System / Q000502:physiology; D008027:Light; D010507:Periodicity; D010775:Photic Stimulation; D010870:Pineal Gland / Q000201:enzymology*; D011247:Pregnancy; D051381:Rats; D014621:Vagina / Q000033:anatomy & histology