Photic regulation of the melatonin rhythm: monkey and man are not the same.
D000818:Animals; D002940:Circadian Rhythm; D000882:Haplorhini; D008027:Light; D008253:Macaca mulatta; D008297:Male; D008550:Melatonin / Q000134:cerebrospinal fluid*; D011863:Radioimmunoassay
D008550:Melatonin