[Rule of antibody structure: the primary structure of a human monoclonal IgA1-immunoglobulin (myeloma protein Tro), II. Cleavage of the monomer IgA-molecule and the reduced and alkylated H- and L-chains by cyanogen bromide (author's transl)].

The monomer of myeloma protein Tro as well as the reduced and alkylated H- and L-chains were cleaved by cyanogen bromide. All cyanogen-bromide fragments were isolated and characterized by amino acid analyses, end-group and molecular weight determinations. The 4 smaller fragments of the 5 H-chain fragments were split with trypsin. The peptides were isolated and their primary structure was determined.