Nicotinic Acetylcholine Receptor α4/CHRNA4 (extracellular) Blocking Peptide (#BLP-NC004) is the original antigen used for immunization during Anti-Nicotinic Acetylcholine Receptor α4 (CHRNA4) (extracellular) Antibody (#ANC-004) generation. The blocking peptide binds and ‘blocks’ Anti-Nicotinic Acetylcholine Receptor α4/CHRNA4 (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.