A majority of suppliers have reported the clone 10.1 to be a mouse monoclonal antibody specific to the human gene, FCGR1A, also known as Fc fragment of IgG receptor Ia and CD64. Other suppliers describe clone 10.1 to be a mouse monoclonal antibody against human IDO1, or indoleamine 2,3-dioxygenase 1. Indicated applications for antibody clone 10.1 include Western blot, immunohistochemistry, flow cytometry, immunofluorescence, immunocytochemistry, and immunoprecipitation.