KCNN4/KCa3.1 Blocking Peptide (#BLP-PC064) is the original antigen used for immunization during Anti-KCNN4 (KCa3.1, SK4) Antibody (#APC-064) generation. The blocking peptide binds and ‘blocks’ Anti-KCNN4/KCa3.1 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.