title: Commentary.
authors: Department of Pathology, Stanford University, Palo Alto, CA 94304, USA. tcowan@stanford.edu
authors: Tina M
authors: TM
authors: Cowan
mesh_terms: D000596:Amino Acids / Q000032:analysis*; D016477:Artifacts; D001826:Body Fluids / Q000737:chemistry*; D002138:Calibration; D002411:Cation Exchange Resins; D006801:Humans; D009555:Ninhydrin; D004364:Pharmaceutical Preparations / Q000652:urine
chemical_list: D000596:Amino Acids; D002411:Cation Exchange Resins; D004364:Pharmaceutical Preparations; D009555:Ninhydrin