Recombinant Anti-CD15 x Anti-CD64 Bispecific Antibody (Tandem scFv) is designed to be expressed as a scFv from an anti-CD15 antibody variable domains fused with a scFv from an anti-CD64 antibody variable domains. It contains a His-tag at the C/N terminus for affinity purification. The BsAb exits as monomer in reducing and non-reducing conditions. This BsAb can retarget neutrophils to tumor cells. It is designed for the research of Leukemia therapy.