Anti-BAFF x Anti-B7RP1 Bispecific Antibody (IgG-IgG) is designed to be generated by crosslinking two full length IgGs, anti-BAFF and anti-B7RP1 parental antibodies. A stable linkage is formed between the two antibodies. This BsAb can bind and inactivate two ligands simultaneously. It can inhibit B cell survival and T cell costimulation. It is designed for the research of Systemic lupus erythematosus (SLE) therapy.