title: Failure to detect type-C virus p30-related antigen in systemic lupus erythematosus: false-positive reaction due to protease activity.
mesh_terms: D000956:Antigens, Viral / Q000032:analysis*; D005189:False Positive Reactions; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D011480:Protease Inhibitors; D011863:Radioimmunoassay / Q000379:methods*; D012190:Retroviridae / Q000276:immunology*
chemical_list: D000956:Antigens, Viral; D011480:Protease Inhibitors