KCNJ5/Kir3.4 Blocking Peptide (#BLP-PC027) is the original antigen used for immunization during Anti-KCNJ5 (Kir3.4) Antibody (#APC-027) generation. The blocking peptide binds and ‘blocks’ Anti-KCNJ5/Kir3.4 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.