title: Measurement of 6-hydroxymelatonin in human urine and its diurnal variations.
mesh_terms: D000328:Adult; D002940:Circadian Rhythm; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008297:Male; D008550:Melatonin / Q000031:analogs & derivatives* / Q000652:urine; D008875:Middle Aged
chemical_list: D008550:Melatonin; C012365:6-hydroxymelatonin