title: Tracer studies from a general biological viewpoint.
mesh_terms: D006801:Humans; D007202:Indicators and Reagents; D007554:Isotopes; D011868:Radioisotopes; D012106:Research
chemical_list: D007202:Indicators and Reagents; D007554:Isotopes; D011868:Radioisotopes
keywords: ISOTOPES/tracer; RADIOACTIVE SUBSTANCES