Immunogen: A synthetic peptide (QHNQWPMGELTC) corresponding amino acids 106-117 of human CXCR7/RDC1 was used as the immunogen, GenBank NP_064707.1. Percent identity by BLAST analysis: Human, Gorilla, Gibbon, Monkey, Marmoset, Mouse, Rat, Hamster, Elephant, Panda, Bovine, Bat, Dog, Horse, Rabbit, Pig, Opossum (100%); Platypus, Xenopus (92%); Turkey (83%).