Used in research and development of immunotherapies targeting autoimmune diseases and certain cancers. Binds specifically to the KID3 antigen, modulating immune cell activity. Enables selective depletion or inhibition of pathogenic B cells while sparing normal immune function. Investigated for use in conditions like systemic lupus erythematosus (SLE) and B-cell lymphomas. Supports diagnostic assays and flow cytometry to identify KID3-expressing cells. Key tool in preclinical studies evaluating targeted biologic therapies.