title: Relation of pineal acetylserotonin methyltransferase activity to daily photoperiod and light intensity.
mesh_terms: D000818:Animals; D002247:Carbon Isotopes; D008027:Light; D008550:Melatonin / Q000096:biosynthesis*; D010870:Pineal Gland / Q000201:enzymology*; D051381:Rats; D014166:Transferases / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes; D014166:Transferases; D008550:Melatonin