title: Periodic changes in rat retinal and pineal melatonin synthesis.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D003714:Denervation; D005246:Feedback; D005260:Female; D008027:Light; D008297:Male; D008550:Melatonin / Q000096:biosynthesis* / Q000378:metabolism; D008780:Methyltransferases / Q000378:metabolism; D010870:Pineal Gland / Q000201:enzymology / Q000378:metabolism*; D051381:Rats; D012160:Retina / Q000201:enzymology / Q000378:metabolism*
chemical_list: D008780:Methyltransferases; D008550:Melatonin