Immunogen: Synthetic peptide QPRHHCARQRLR from an internal region of human CHRNB2 (NP_000739.1). Percent identity by BLAST analysis: Human, Gorilla, Monkey, Marmoset, Elephant, Bat (100%); Mouse, Rat, Hamster, Bovine, Dog, Pig, Opossum (92%); Ferret, Xenopus (83%).