title: The influence of CEA-S from different tumors and of CEA as 125I ligands on the specificity of the CEA-S radioimmunoassay.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D002272:Carcinoembryonic Antigen / Q000032:analysis* / Q000302:isolation & purification; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D007106:Immune Sera; D009369:Neoplasms / Q000175:diagnosis*; D011863:Radioimmunoassay / Q000379:methods*
chemical_list: D000596:Amino Acids; D002272:Carcinoembryonic Antigen; D007106:Immune Sera