title: Iodine-129 as a "nonradioactive" tracer.
mesh_terms: D000201:Activation Analysis; D066298:In Vitro Techniques; D007457:Iodine Radioisotopes; D011874:Radiometry; D013960:Thyroid Function Tests; D013970:Thyronines; D014284:Triiodothyronine
chemical_list: D007457:Iodine Radioisotopes; D013970:Thyronines; D014284:Triiodothyronine