Immunogen: Synthetic 18 amino acid peptide from C-terminus of human PTGER4 / EP4. Percent identity with other species by BLAST analysis: Human, Chimpanzee, Gorilla, Gibbon, Monkey, Marmoset, Mouse, Rat, Hamster, Elephant, Panda, Bat, Dog, Bovine, Horse (100%); Turkey, Chicken (94%); Rabbit, Opossum, Guinea pig (89%).