The monoclonal antibodies used were: OKT3, T11, Leu-1 (pan T cell specific); Leu-3A (T "helper" specific); Leu-2A, OKT8 (T "suppressor" specific); immunoglobulin (Ig) antibodies: anti kappa and lambda light chains, anti mu and delta heavy chains; B1 (anti B lymphocyte); CA2-11 (anti HLA-DR); OKM1, Mo-2 (anti myeloid/monocyte); OKT9 (anti transferrin receptor); Leu-7 (anti "NK" cell) and J5 (anti common ALL antigen). The gene discussed is IGKJ5; the disease is acute lymphoblastic leukemia.