title: Letter: Stated values for commercial sera may be unreliable from date of manufacture.
mesh_terms: D000469:Alkaline Phosphatase / Q000097:blood; D001219:Aspartate Aminotransferases / Q000097:blood; D004796:Clinical Enzyme Tests / Q000592:standards*; D006801:Humans
chemical_list: D001219:Aspartate Aminotransferases; D000469:Alkaline Phosphatase