Immunogen: Synthetic 18 amino acid peptide from 1st cytoplasmic domain of human HRH4 / Histamine H4 Receptor. Percent identity with other species by BLAST analysis: Human, Monkey, Marmoset (100%); Bovine, Horse, Rabbit (94%); Gibbon, Mouse, Panda, Dog (89%); Rat, Opossum, Platypus (83%).