title: LIGHT-DARK PERIODICITY AND THE RHESUS-MONKEY MENSTRUAL CYCLE.
mesh_terms: D000818:Animals; D003624:Darkness; D005260:Female; D000882:Haplorhini; D006801:Humans; D008027:Light; D008253:Macaca mulatta; D008597:Menstrual Cycle; D008598:Menstruation; D008599:Menstruation Disturbances; D010053:Ovary; D010507:Periodicity; D010827:Physiology; D012106:Research
keywords: DARKNESS; EXPERIMENTAL LAB STUDY; LIGHT; MENSTRUATION; MONKEYS; OVARY; PERIODICITY; PHYSIOLOGY