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. 1999 Jun;127(3):788–794. doi: 10.1038/sj.bjp.0702590

Figure 5.

Figure 5

Interactions of NO and superoxide. Formation of peroxynitrite (ONOO) is dependent on the concentration of superoxide (O2.−) and nitric oxide (NO). When levels of NO rise above a critical level, the reaction between NO and O2.− predominates and superoxide dismutase (SOD) is unable to compete.