Clone 6B12 has been reported to be a mouse monoclonal antibody specific to the human gene, ESR2, or Estrogen receptor 2. Other suppliers describe clone 6B12 to be a mouse monoclonal antibody against human HSP90B1, or heat shock protein 90 beta family member 1. Indicated applications for antibody clone 6B12 include Western blot, immunohistochemistry, and ELISA.