Clone 9A3 has been reported to be a mouse monoclonal antibody specific to the human gene, A2M, or Alpha-2-macroglobulin. Other suppliers describe clone 9A3 to be a mouse monoclonal antibody against human PRDX4, or peroxiredoxin 4. Indicated applications for antibody clone 9A3 include Western blot, immunohistochemistry, immunofluorescence, ELISA, immunocytochemistry, and immunoprecipitation.