Clone 11A1 has been reported to be a mouse monoclonal antibody specific to the human gene, CAT, or Catalase. Other suppliers describe clone 11A1 to be a mouse monoclonal antibody against human CD4, or CD4 molecule. Suppliers have reported additional species reactivites for the target of this clone, including mouse and rat. Indicated applications for antibody clone 11A1 include Western blot, immunohistochemistry, and immunofluorescence.