Immunogen: Synthetic peptide C-QKLTNKNNKIED from an internal region of human GCC2 (NP_055450.1; NP_852118.1). Percent identity by BLAST analysis: Human, Gibbon (100%); Gorilla, Monkey, Marmoset, Rat, Hamster, Elephant, Bat, Horse, Rabbit (92%); Mouse, Bovine, Pig (83%).