Description: The M3.2D7 monoclonal antibody was generated against and reacts with mouse B7-H3, a member of the B7 family of the Ig superfamily proteins. B7-H3 is reported to be expressed by antigen presenting cells and developing bone during embryogenesis. The ligand for B7-H3 has not yet been identified and it is thought that B7-H3 down-regulates T cell functions by engaging an unknown counter receptor on T cells. M3.2D7 stains mouse B7-H3 transfected cells and not mouse spleen cells. M3.2D7 also stains human B7-H3 transfected cells.