Recombinant Anti-CD3 x Anti-FcRH5 Bispecific Antibody (scDiabody-CH3) is a fusion protein of two scDiabodies connected together by a CH3 region. In single-chain Diabodies, an additional connecting linker is introduced between chains of the anti-CD3/anti-FcRH5 diabody. The scDiabody with two specificities is fused to each of the CH3 chains to extend half-life. This BsAb can retarget T cells to tumor cells. It is designed for the research of Multiple myeloma (MM); B cell malignancies therapy.