Recombinant Anti-CD38 x Anti-saporin Bispecific Antibody (IgG-scFv) is designed to be expressed as a LC and an extended HC with scFv moiety linked to the C terminus. It is a symmetric bispecific and tetravalent molecule, bivalent for each antigen specificity, 2+2 antigen-binding valency. This BsAb can be used in pretargeting system and deliver immunotoxin to tumor cells. It is designed for the research of Multiple myeloma (MM); Hematologic malignancies therapy.