Recombinant Anti-VEGFB x Anti-VEGF Bispecific Antibody (Tandem Fab) is designed to be expressed as three chains derived from the variable domains of anti-VEGFB and anti-VEGF parental antibodies. It contains a His-tag for affinity purification. And the two Fd regions are connected by a flexible linker. This BsAb can block two proangiogenics simultaneously. It is designed for the research of Cancers therapy.