Immunogen: Synthetic peptide C-NLPARFTHFHGE from an internal region of human CYP26A1 (NP_000774.2; NP_476498.1). Percent identity by BLAST analysis: Human, Gorilla, Gibbon, Monkey (100%); Marmoset (92%); Rat, Hamster, Elephant, Panda, Bat, Dog, Rabbit (83%).