C4d Complement fragment Monoclonal Antibody [C3F.7]C4d Antibody Complement fragment Monoclonal Antibody [C3F. 7] is a mouse monoclonal antibody. This antibody recognizes Human antigen. C4d Antibody Complement fragment Monoclonal Antibody [C3F. 7] has been successfully used in Immunohistochemistry. This a purified antibody containing PBS + 10mM sodium azide. C4 is a component of the classical complement pathway and is split by activated C1s to C4a and C4b. Together C2a and C4b forms the classical C3