Connexin-40/GJA5 Blocking Peptide (#BLP-CC205) is the original antigen used for immunization during Anti-Connexin-40 (GJA5) Antibody (#ACC-205) generation. The blocking peptide binds and ‘blocks’ Anti-Connexin-40/GJA5 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.