The CD44 (E7K2Y) XP ® Rabbit mAb (BSA and Azide Free) Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody to CD44. This antibody recognizes Homo Sapiens, Human, Mouse, and Rat antigen. The CD44 (E7K2Y) XP ® Rabbit mAb (BSA and Azide Free) Antibody has been shown to work in the following applications: Immunohistochemistry, Immunohistochemistry - fixed, and Western Blot.