title: A light microscopy study of the pineal gland of rats at different hours of the day.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D003624:Darkness; D008027:Light; D008297:Male; D009929:Organ Size; D010870:Pineal Gland / Q000166:cytology* / Q000502:physiology; D051381:Rats; D013347:Subcellular Fractions