The IgM (E9U8J) XP ® Rabbit mAb Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody to Ighm. This antibody recognizes Homo Sapiens, and Human antigen. The IgM (E9U8J) XP ® Rabbit mAb Antibody has been shown to work in the following applications: Immunohistochemistry, Immunohistochemistry - fixed, and Western Blot.