The CD28 (D2Z4E) Rabbit mAb (BSA and Azide Free) Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody to CD28. This antibody recognizes Homo Sapiens, Human, and Mouse antigen. The CD28 (D2Z4E) Rabbit mAb (BSA and Azide Free) Antibody has been shown to work in the following applications: Immunofluorescence, Immunohistochemistry, Immunohistochemistry - fixed, and Western Blot.