title: Identity of PL3A and SB1.
mesh_terms: D001402:B-Lymphocytes / Q000276:immunology*; D005802:Genes, MHC Class II; D006650:Histocompatibility Testing; D006801:Humans; D007158:Immunologic Techniques; D007959:Lymphocyte Culture Test, Mixed; D010641:Phenotype