Myeloperoxidase Deficiency, also known as mpo deficiency, is related to chronic myelomonocytic leukemia and chronic granulomatous disease. An important gene associated with Myeloperoxidase Deficiency is MPO (Myeloperoxidase), and among its related pathways/superpathways are Calnexin/calreticulin cycle and Antigen Presentation: Folding, assembly and peptide loading of class I MHC. Affiliated tissues include monocytes and neutrophil, and related phenotypes are abnormality of the immune system and abnormality of metabolism/homeostasis