Recombinant Anti-TG x Anti-TPO Bispecific Antibody (Tandem Fab) is designed to be expressed as three chains derived from the variable domains of anti-TG and anti-TPO 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 two antigens simultaneously and block the synthesis of thyroid hormones. It is designed for the research of Autoimmune thyroid disease therapy.