R&D Systems, a Bio-Techne Brand's Human Complement Component C3a Antibody is a Mouse monoclonal antibody. The Human Complement Component C3a Antibody was generated using C3, and complement C3 as the antigen. It reacts with Homo Sapiens, and Human. This antibody has been shown to work in applications such as: EIA, Immunoassay, ELISA, and Western Blot.