title: Plasma melatonin in the trout: day-night change demonstrated by radioimmunoassay.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D005260:Female; D008297:Male; D008550:Melatonin / Q000097:blood*; D008722:Methods; D011863:Radioimmunoassay; D012487:Salmonidae / Q000097:blood*; D014337:Trout / Q000097:blood*
chemical_list: D008550:Melatonin