title: Diurnal variation in cyclic A.M.P. in plasma.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002940:Circadian Rhythm; D000242:Cyclic AMP / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D000242:Cyclic AMP