A majority of suppliers have reported the clone SPM289 to be a mouse monoclonal antibody specific to the human gene, HLA-DRB1, also known as Major histocompatibility complex, class II, DR beta 1 and HLA-DR. Other suppliers describe clone SPM289 to be a mouse monoclonal antibody against human HLA-DRA, or major histocompatibility complex, class II, DR alpha. Indicated applications for antibody clone SPM289 include Western blot, immunohistochemistry, flow cytometry, immunofluorescence, immunocytochemistry, and immunoprecipitation.