title: Differential absorption of purine nucleotides, nucleosides and bases.
mesh_terms: D000481:Allantoin / Q000652:urine; D000493:Allopurinol / Q000494:pharmacology*; D000818:Animals; D004032:Diet; D007042:Hypoxanthines / Q000652:urine; D011687:Purines / Q000652:urine*; D013552:Swine; D014970:Xanthines / Q000652:urine
chemical_list: D007042:Hypoxanthines; D011687:Purines; D014970:Xanthines; D000481:Allantoin; D000493:Allopurinol