PACAP (1-27)，human，ovine，rat

PACAP (1-27)， human， ovine， rat (PACAP 1-27) is the N-terminal fragment of PACAP-38， and is a potent PACAP receptor antagonist with IC50s of 3 nM， 2 nM and 5 nM for rat PAC1， rat VPAC1 and human VPAC2， respectively.