title: Daily melatonin injections: their usefulness in understanding photoperiodism in Peromyscus leucopus.
mesh_terms: D000818:Animals; D005260:Female; D008027:Light; D008550:Melatonin / Q000494:pharmacology*; D010507:Periodicity; D010542:Peromyscus / Q000502:physiology; D012098:Reproduction / Q000187:drug effects*; D013997:Time Factors
chemical_list: D008550:Melatonin