Immunogen: Peptide sequence corresponding to amino acids 23-40 (GKRDFVDHLDKVDPVDG) of human ARRB2 was used as the immunogen, Gen Bank no. gb|ABG47460.1|. Percent identity by BLAST analysis: Human, Gorilla, Orangutan, Gibbon, Monkey, Marmoset, Mouse, Rat, Dog, Bat, Bovine, Elephant, Panda, Horse, Rabbit, Pig (100%); Opossum, Xenopus, Zebrafish, Stickleback (94%); Hamster (88%); Beetle (82%).