The MUC5AC (E3O9I) XP ® Rabbit mAb (BSA and Azide Free) Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody to MUC5AC. This antibody recognizes Homo Sapiens, and Human antigen. The MUC5AC (E3O9I) XP ® Rabbit mAb (BSA and Azide Free) Antibody has been shown to work in the following applications: Immunocytochemistry, Immunofluorescence, Immunohistochemistry, and Immunohistochemistry - fixed.