GluR4/GluA4 (extracellular) Blocking Peptide (#BLP-GC019) is the original antigen used for immunization during Anti-GluR4 (GluA4) (extracellular) Antibody (#AGC-019) generation. The blocking peptide binds and ‘blocks’ Anti-GluR4/GluA4 (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.