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Two human B lymphocyte-associated antigens, B1 and B2, were studied by immunoprecipitation using monoclonal antibodies. B1 was found to be a nonglycosylated protein of MW 35 kD, phosphorylated at serine and threonine. B2, a 140 kD MW antigen, was characterized as a glycoprotein without phosphorylated sites. Both proteins were found to contain portions which could be labeled with 125I-iodonaphthylazide. The B1 protein displayed hydrophobic properties whereas B2 had a more amphiphilic character.
Oettgen et al. (Sat,) studied this question.
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