A majority of suppliers have reported the clone 133 to be a mouse monoclonal antibody specific to the human gene, PRKCA, or Protein kinase C alpha. Other suppliers describe clone 133 to be a mouse monoclonal antibody against human EBAG9, or estrogen receptor binding site associated antigen 9. This antibody clone has been reported to also recognize the virus ortholog of the target gene. Indicated applications for antibody clone 133 include Western blot, immunohistochemistry, immunofluorescence, and ELISA.