The CD39/NTPDase 1 (E2X6B) XP ® Rabbit mAb (BSA and Azide Free) Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody to ENTPD1. This antibody recognizes Mouse antigen. The CD39/NTPDase 1 (E2X6B) XP ® Rabbit mAb (BSA and Azide Free) Antibody has been shown to work in the following applications: Immunohistochemistry, Immunohistochemistry - fixed, and Western Blot.