PACAP Receptor 1/PAC1 Blocking Peptide (#BLP-VR003) is the original antigen used for immunization during Anti-PACAP Receptor 1 (PAC1) Antibody (#AVR-003) generation. The blocking peptide binds and ‘blocks’ Anti-PACAP Receptor 1/PAC1 primary antibody, this makes it a good negative reagent control to help confirm antibody specificity in western blot and immunohistochemistry applications. This control is also often called a pre-adsorption control.