Immunogen: Synthetic 18 amino acid peptide from 1st extracellular domain of human GPR18. Percent identity with other species by BLAST analysis: Human, Gorilla, Gibbon, Monkey (100%); Marmoset, Mouse, Hamster, Panda, Dog, Horse (94%); Rat, Bat, Bovine (89%); Elephant, Rabbit, Pig (83%).