RT Journal Article SR Electronic T1 Two populations of Ia-like molecules on a human B cell line. JF The Journal of Immunology JO J. Immunol. FD American Association of Immunologists SP 293 OP 299 VO 125 IS 1 A1 Lampson, L A A1 Levy, R YR 1980 UL http://www.jimmunol.org/content/125/1/293.abstract AB Evidence is presented for two populations of Ia-like molecules on the human B cell line Raji. Two monoclonal antibodies, L203 and L227, are described. Both recognize nonpolymorphic determinants on B cell antigens. Both immunoprecipitate 34,000- and 28,000-dalton material from 125I-labeled extracts of Raji, but L227 precipitates 25,000-dalton material as well. Immunodepletion experiments confirm that the antibodies react with two different populations of molecules.