Human C3aR (extracellular) Blocking Peptide (#BLP-AR031) is the original antigen used for immunization during Anti-Human C3aR (extracellular) Antibody (#AAR-031) generation. The blocking peptide binds and ‘blocks’ Anti-Human C3aR (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.