The physiology of circadian pacemakers.
D000818:Animals; D001717:Birds; D012831:Bombyx; D001921:Brain / Q000502:physiology; D002645:Chickens; D002940:Circadian Rhythm; D003058:Cockroaches; D006224:Cricetinae; D006801:Humans; D007031:Hypothalamus / Q000502:physiology; D009799:Ocular Physiological Phenomena; D010870:Pineal Gland / Q000502:physiology; D011817:Rabbits; D051381:Rats; D012908:Snails