Recombinant Anti-CD3 x Anti-HER2 Bispecific Antibody (Tandem Fab) is designed to be expressed as three chains derived from the variable domains of anti-CD3 and anti-HER2 parental antibodies. It contains a His-tag for affinity purification. And the two Fd regions are connected by a flexible linker. This BsAb can retarget T cells to tumor cells. It is designed for the research of Breast cancer; Gastric cancer; Prostate cacncer; Ovarian cancer; Solid tumors therapy.