Strain: Lewis(B cell); BALB/c (myeloma) Isoenzyme: IgM Production: immunoglobulin; monoclonal antibody; against mouse cortical thymocytes, erythrocytes, neutrophils and B lymphocytes (B cells); cytotoxic Histopathology: hybridoma; mouse(myeloma) Note: animals were immunized with C3H/HeJ thymocytes; spleen cells were fused with Sp2/0-Ag14 myeloma cells; the antibody does not react with mature (medullary) thymocytes, pluripotential stem cells, platelets or cells of monocyte-macrophage lineage; IgG antibody producing cells are strongly positive for the J11d.2 antigen; tested and found negative for for ectromelia virus (mousepox)