title: Inborn nature of the rat's 24-hour clock.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D001683:Biological Clocks; D001766:Blindness / Q000473:pathology / Q000503:physiopathology; D001835:Body Weight; D001921:Brain / Q000473:pathology; D002940:Circadian Rhythm; D003624:Darkness; D005260:Female; D008027:Light; D008124:Locomotion; D008297:Male; D009043:Motor Activity; D010507:Periodicity; D051381:Rats; D012890:Sleep