The CD20 (E3N7O) XP ® Rabbit mAb (BSA and Azide Free) Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody to MS4A1. This antibody recognizes Mouse, and Rat antigen. The CD20 (E3N7O) XP ® Rabbit mAb (BSA and Azide Free) Antibody has been shown to work in the following applications: Immunofluorescence, Immunohistochemistry, Immunohistochemistry - fixed, and Western Blot.