Immunogen: Synthetic 18 amino acid peptide from C-terminus of human Kappa Opioid Receptor. Percent identity with other species by BLAST analysis: Human, Gorilla, Gibbon, Monkey (100%); Marmoset, Bat, Dog, Bovine, Hamster, Panda, Horse, Rabbit, Guinea pig (94%); Mouse, Rat, Elephant, Turkey, Chicken (89%).