title: Problem of the unit of reference in expressing biomedical data.
mesh_terms: D001681:Biological Assay / Q000592:standards*; D002624:Chemistry, Clinical / Q000592:standards*; D004247:DNA / Q000032:analysis; D006801:Humans; D009584:Nitrogen / Q000032:analysis; D009929:Organ Size; D011506:Proteins / Q000032:analysis; D009626:Terminology as Topic
chemical_list: D011506:Proteins; D004247:DNA; D009584:Nitrogen