Blocking Peptide for H1865-05A Hemopexin (HPX) Hemopexin (HPX) is a plasma protein that has the highest binding affinity for heme. HPX prevents heme-mediated oxidative stress and heme-bound iron loss by transporting heme to the liver for breakdown. Source: Synthetic peptide surrorounding aa436 of mouse Hemopexin. Applications: Suitable for use in ELISA and Antibody Blocking.