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Fig. 4. Effect of eTN of CcO on the [O2] at which VO2 becomes inhibited in induced Tet-iNOS 293 cells in the absence (blue) and presence (red) of 2.5 µM L-arginine (n=3 for each eTN group). Inset shows the changes in VO2 upon addition of 2.5 µM L-arginine at 70 µM O2 for eTN values (in electrons per second) of 49.0±3.2 (open circles), 60.2±0.9 (closed squares), 84.1±2.7 (open triangles) and 103.3±11.7 (crosses).