Immunogen: Synthetic peptide located between aa252-301 of human ABCB4 (A4D1D4, NP_000434). Percent identity by BLAST analysis: Human, Chimpanzee, Gibbon, Monkey, Marmoset, Mouse, Rat, Hamster, Elephant, Rabbit (100%); Galago, Panda, Opossum (92%); Bovine (85%).