5HT2A Receptor/HTR2A (extracellular) Blocking Peptide (#BLP-SR033) is the original antigen used for immunization during Anti-5HT2A Receptor (HTR2A) (extracellular) Antibody (#ASR-033) generation. The blocking peptide binds and ‘blocks’ Anti-5HT2A Receptor/HTR2A (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.