The HLA-DRA (E9R2Q) XP ® Rabbit mAb (BSA and Azide Free) Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody. This antibody recognizes Homo Sapiens, Human, and Non-Human Primate antigen. The HLA-DRA (E9R2Q) XP ® Rabbit mAb (BSA and Azide Free) Antibody has been shown to work in the following applications: Immunohistochemistry, Immunohistochemistry - fixed, and Western Blot.