The CD23 (E1R4G) Rabbit mAb (BSA and Azide Free) Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody to FCER2. This antibody recognizes Homo Sapiens, and Human antigen. The CD23 (E1R4G) Rabbit mAb (BSA and Azide Free) Antibody has been shown to work in the following applications: Immunohistochemistry, and Immunohistochemistry - fixed.