特異性:Recognizes Met5-and Leu5-enkephalin. Displays about 40% crossreactivity with C-terminal extended Met-enkephalin hexapeptides and 7% crossreactivity with the extended heptapeptide (-Arg-Phe-OH) but does not recognize other endogenous peptides. By Immunohistochemistry no crossreactivity to beta-endorphin or dynorphin. Species Crossreactivity: rat, guinea pig, hamster and rabbit.