Immunogen: Synthetic peptide corresponding to aa 14-40 (YSEEVGSGDYDSNKEPCFRDENVHFNR) of the N-terminal extracellular domain of mouse CXCR4 (CXC chemokine receptor 4). Percent identity by BLAST analysis: Mouse (100%); Rat (93%); Baboon, Monkey, Marmoset, Elephant, Rabbit (81%).