PAR4/F2RL3 (extracellular) Blocking Peptide (#BLP-PR034) is the original antigen used for immunization during Anti-PAR4 (F2RL3) (extracellular) Antibody (#APR-034) generation. The blocking peptide binds and ‘blocks’ Anti-PAR4/F2RL3 (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.