VPAC1/VIPR1 (extracellular) Blocking Peptide (#BLP-VR001) is the original antigen used for immunization during Anti-VPAC1 (VIPR1) (extracellular) Antibody (#AVR-001) generation. The blocking peptide binds and ‘blocks’ Anti-VPAC1/VIPR1 (extracellular) 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.