Recombinant Anti-HER2 x Anti-HER3 Bispecific Antibody (Tandem Fab) is designed to be expressed as three chains derived from the variable domains of anti-HER2 and anti-HER3 parental antibodies. It contains a His-tag for affinity purification. And the two Fd regions are connected by a flexible linker. This BsAb can bind and inactivate two receptors simultaneously. It is designed for the research of Breast cancer; Gastric cancer; Prostate cacncer; Ovarian cancer; Solid tumors therapy.