Abstract
The partial amino acid sequence of the NH2 terminus of a factor named human B-cell differentiation factor or B-cell stimulatory factor 2 (BSF-2) has been determined. Antibodies raised against the synthetic peptide corresponding to residues 1-13 of the NH2-terminal sequence specifically react with BSF-2 generated by a T-cell line and by phytohemagglutinin-stimulated normal T cells. Furthermore, the antipeptide antibodies react with a BSF-2-like factor produced by cardiac myxoma as well as uterine cervical carcinoma cells. The results show that BSF-2 functions in vivo as well and suggest that the constitutive production of BSF-2 may be involved in autoantibody production, since patients with cardiac myxoma and uterine carcinoma showed autoantibody production.
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