Immunogen: Synthetic peptide C-DYRLTWNSSRYEGVN from an internal region of human CHRNB4 (NP_000741.1). Percent identity by BLAST analysis: Human, Gorilla, Gibbon, Marmoset (100%); Elephant, Panda, Dog, Bovine, Pig (93%); Mouse, Rat, Hamster, Horse, Opossum (87%).