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Release of NO and quenching of superoxide by GSNO. Superoxide anions (O2.−) were generated by incubation of xanthine oxidase (0.1 U ml−1) and xanthine (1×10−4 M). The effects of increasing concentrations of S-nitrosoglutathione (GSNO) on O2.− chemiluminescence and release of NO are shown. Results are the mean s.e.mean of four experiments.
