A majority of suppliers have reported the clone SP6 to be a monoclonal antibody specific to the human gene, MKI67, or Marker of proliferation Ki-67. Other suppliers describe clone SP6 to be a monoclonal antibody against human STX1A, or syntaxin 1A. Indicated applications for antibody clone SP6 include Western blot, immunohistochemistry, flow cytometry, immunofluorescence, ELISA, and immunocytochemistry.