title: Diurnal variations of free amino acids and ammonia levels in the blood of sheep given urea.
mesh_terms: D000596:Amino Acids / Q000097:blood*; D000641:Ammonia / Q000097:blood*; D000818:Animals; D001806:Blood Urea Nitrogen; D002940:Circadian Rhythm; D006801:Humans; D012756:Sheep / Q000378:metabolism*; D014508:Urea / Q000008:administration & dosage*
chemical_list: D000596:Amino Acids; D000641:Ammonia; D014508:Urea