Endothelin Receptor B Blocking Peptide (#BLP-ER002) is the original antigen used for immunization during Anti-Endothelin Receptor B Antibody (#AER-002) generation. The blocking peptide binds and ‘blocks’ Anti-Endothelin Receptor B 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.