title: Effect of long or short photoperiod on pineal melatonin content in the white-footed mouse, Peromyscus leucopus.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D005260:Female; D008297:Male; D008550:Melatonin / Q000378:metabolism*; D010542:Peromyscus / Q000502:physiology*; D010870:Pineal Gland / Q000502:physiology*; D012737:Sex Factors; D013997:Time Factors
chemical_list: D008550:Melatonin