Human autoantibody against Sm antigen, buffered with 0.01M phosphate, 0.13 M NaCl, 0.02% NaN3. For use in ENA Ouchterlony kit. Shows the Sm precipitate band when tested using double immunodiffusion against rabbit thymus extract (RTE-1000). 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.