A majority of suppliers have reported the clone 5G12 to be a mouse monoclonal antibody specific to the human gene, IGHG3, also known as Immunoglobulin heavy constant gamma 3 (G3m marker) and IgG3. Other suppliers describe clone 5G12 to be a mouse monoclonal antibody against human KLF1, or Kruppel like factor 1. Indicated applications for antibody clone 5G12 include Western blot, immunofluorescence, and ELISA.