xCT/SLC7A11 (extracellular) Blocking Peptide (#BLP-NT111) is the original antigen used for immunization during Anti-xCT/SLC7A11 (extracellular) Antibody (#ANT-111) generation. The blocking peptide binds and ‘blocks’ Anti-xCT/SLC7A11 (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.