Serotonin Transporter/SERT (extracellular) Blocking Peptide (#BLP-MT004) is the original antigen used for immunization during Anti-Serotonin Transporter (SERT) (extracellular) Antibody (#AMT-004) generation. The blocking peptide binds and ‘blocks’ Anti-Serotonin Transporter/SERT (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.