CCKBR (extracellular) Blocking Peptide (#BLP-CR042) is the original antigen used for immunization during Anti-CCKBR (extracellular) Antibody (#ACR-042) generation. The blocking peptide binds and ‘blocks’ Anti-CCKBR (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.