Shows only the Scl-70 precipitate band when tested using double immunodiffusion against rabbit thymus extract. Specificity is verified by identity of precipitation with CDC-AF reference serum. The titer obtained will vary with the test system; however, undiluted antibody shows a strong Scl-70 precipitate band. Product shows no reactivity at a dilution of 1:100 when tested against purified SSA, SSB, Sm, Sm/RNp and Jo -1 antigen in an ELISA system designed to detect all IgG subclasses.

Store at < 0 °C.