A majority of suppliers have reported the clone L243 to be a mouse monoclonal antibody specific to the human gene, HLA-DRA, also known as Major histocompatibility complex, class II, DR alpha and HLA-DR. Other suppliers describe clone L243 to be a mouse monoclonal antibody against human HLA-DRB1, or major histocompatibility complex, class II, DR beta 1. Indicated applications for antibody clone L243 include Western blot, immunohistochemistry, flow cytometry, immunofluorescence, immunocytochemistry, and immunoprecipitation.