title: Effect of light on the serotonin content of the pineal gland.
mesh_terms: D000818:Animals; D003080:Cold Temperature; D003624:Darkness; D008027:Light; D008297:Male; D010870:Pineal Gland / Q000032:analysis*; D051381:Rats; D012701:Serotonin / Q000032:analysis*; D013997:Time Factors
chemical_list: D012701:Serotonin