Myeloperoxidase (MPO) is highly expressed in neutrophils and polymorphonuclear luekocytes. MPO is expressed as a dimer in regular neutrophils with a 140 kDA. The glycosylated form of MPO has a molecular weight of 92 kDa and when undergoes a final glycosylation, MPO forms subunits of 60 kDa and 12 kDa. In recent studies, MPO was shown to be involved in the initiation and progression of cardiovascular disease.