ProSci, Inc's CD40 Antibody [3/23], Rat IgG2a monoclonal antibody. The CD40 Antibody [3/23], Rat IgG2a was generated using CD40 as the antigen. It reacts with Mouse. This antibody has been shown to work in applications such as: Precipitation, Flow Cytometry, Immunohistochemistry, and Immunoprecipitation.