Description
A disulphide-linked heterodimer, consisting of mb-1 (or CD79a) and B29 (or CD79b) polypeptides, is non-covalently associated with membrane-bound immunoglobulins on B cells. This complex of mb-1 and B29 polypeptides and immunoglobulin constitute the B cell Ag receptor. CD79a first appears at pre B cell stage, early in maturation, and persists until the plasma cell stage where it is found as an intracellular component. CD79a is found in the majority of acute leukemias of precursor B cell type, in B cell lines, B cell lymphomas, and in some myelomas. It is not present in myeloid or T cell lines. CD79a antibody is generally used to complement CD20 antibody especially for mature B-cell lymphomas after treatment with Rituximab (anti-CD20). This antibody cocktail will stain many of the same lymphomas as CD20 antibody, but also is more likely to stain B-lymphoblastic lymphoma/leukemia than is CD20 antibody. CD79a antibody also stains more cases of plasma cell myeloma and occasionally some types of endothelial cells as well