Myeloperoxidase is a heme protein which catalyzes oxidations by hydrogen peroxide, including MPO- chloride mediated killing of microbes and tumor cells, inactivation of hemotactic factors, crosslinking of proteins and inclination of proteins. Description: Human neutrophils. Alternative Names: 89 kDa myeloperoxidase protein, MPO protein, 84 kDa myeloperoxidase protein, Myeloperoxidase protein, Myeloperoxidase light chain proteinMyeloperoxidase heavy chain