Human anti Sm Antigen

Shows the Sm precipitate band when tested using double immunodiffusion against rabbit thymus extract. Specificity is verified by identity of precipitation with CDC-AF reference serum. Anti-RNP precipitant is also detected. Titer will vary with test system; however, undiluted antibody shows a strong Sm precipitate band. Exhibits no reactivity at a dilution of 1:100 when tested against purified SSB, Scl-70 and Jo-1 antigens in an ELISA system designed to detect all IgG subclasses. Anti-RNP and low levels of anti-SSA activity are detected in this ELISA system.