title: Letter: R.I.A. kit for assay of hepatitis-B antigen.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D011863:Radioimmunoassay / Q000592:standards*
chemical_list: D006511:Hepatitis B Antigens