Prostaglandin E Receptor EP3/PTGER3 Blocking Peptide (#BLP-PR065) is the original antigen used for immunization during Anti-Prostaglandin E Receptor EP3 (PTGER3) Antibody (#APR-065) generation. The blocking peptide binds and ‘blocks’ Anti-Prostaglandin E Receptor EP3/PTGER3 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.