Clone 9G4 has been reported to be a mouse monoclonal antibody specific to the human gene, FH, or Fumarate hydratase. Other suppliers describe clone 9G4 to be a mouse monoclonal antibody against human PRKG1, or protein kinase cGMP-dependent 1. Indicated applications for antibody clone 9G4 include Western blot, immunohistochemistry, flow cytometry, immunofluorescence, ELISA, and immunocytochemistry.