<prompt> Reactive oxygen intermediates are released by:CatalaseNADPH oxidaseGlutathione peroxidaseSuperoxide dismutase  <response>: Oxygen dependent killing is largely mediated through Reactive Oxygen Intermediates ROI. The generation of reactive oxygen intermediates is due to the rapid activation of an oxidase, NADPH oxidase. Catalase, Superoxide dismutase and Glutathione peroxidase are radical scavenging enzymes that prevent oxygen mediated injury. Ref: Robbins Illustrated Pathology, 7th Edition, Pages 16, 17, 60 