Immunogen: Synthetic peptide KLIEKFQKCSADESP from the C-terminus of human MST4 (NP_057626.2; NP_001035918.1; NP_001035917.1). Percent identity by BLAST analysis: Human, Gorilla, Gibbon, Marmoset, Mouse, Rat, Dog (100%); Monkey, Hamster, Bovine (93%).