title: Interference of 4-amino-4-deoxy-N10-methylpteroic acid with the radioimmunoassay of methotrexate.
mesh_terms: D000818:Animals; D005243:Feces / Q000032:analysis; D006801:Humans; D008727:Methotrexate / Q000031:analogs & derivatives* / Q000032:analysis*; D051379:Mice; D011863:Radioimmunoassay / Q000379:methods; D051381:Rats
chemical_list: C000203:deoxyaminopteroic acid; D008727:Methotrexate