Clone P2B1 has been reported to be a mouse monoclonal antibody specific to the human gene, DUX4, or Double homeobox 4. Other suppliers describe clone P2B1 to be a mouse monoclonal antibody against human DUX4L1, or double homeobox 4 like 1 (pseudogene). Indicated applications for antibody clone P2B1 include Western blot, immunohistochemistry, immunofluorescence, immunocytochemistry, and immunoprecipitation.