the formation of oxygen-derived free radicals by the phagocytes ( neutrophils , eosinophils , monocytes and macrophages ) is catalysed by a membrane-bound nadph oxidase which is dormant in resting cells and becomes activated during phagocytosis or following interaction of the cells with suitable soluble stimulants .
C0031307
phagocytes
C0031308
phagocytosis