The CD19 (Intracellular Domain) (D4V4B) XP ® Rabbit mAb (PE Conjugate) Antibody from Cell Signaling Technology is a Rabbit Monoclonal antibody to CD19. This antibody recognizes Homo Sapiens, Human, Mouse, and Non-Human Primate antigen. The CD19 (Intracellular Domain) (D4V4B) XP ® Rabbit mAb (PE Conjugate) Antibody has been shown to work in the following applications: Flow Cytometry.