mpo netNeutrophil extracellular traps (NETs) are extracellular chromatin fibers adorned with antimicrobial proteins, such as myeloperoxidase (MPO), which are extruded from activated neutrophils.NETs are DNA-containing structures released by neutrophils that incorporate intracellular factors, such as histones, myeloperoxidase (MPO) and elastase. NETs have a