D4 Dopamine Receptor Blocking Peptide (#BLP-DR004) is the original antigen used for immunization during Anti-D4 Dopamine Receptor Antibody (#ADR-004) generation. The blocking peptide binds and ‘blocks’ Anti-D4 Dopamine Receptor 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.