To this end, we employed gp91phox-/-, wt, and wt + N-acetyl-l-cysteine (NAC), a free radical scavenger which inhibits ROS activity [40], pre-treated bone marrow derived monocytes and added r-IFN-γ immediately after L. major-RFP infection to assess differences in parasite control. The gene discussed is IFNG; the disease is infection.