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The generation of nitric oxide from Angeli's salt stimulated by (a) methaemoglobin (MetHb 10 μM), ferricytochrome c (Cyt. C 10 μM), ferric chloride (FeCl3 0.1 mM), or ferrous sulphate (FeSO4 0.1 mM) and (b) manganese chloride (MnCl2 0.1 mM) or MnTMPyP (0.1 mM). Each point is the mean and error bars indicate the s.e.mean of 5–9 observations. *P<0.05, **P<0.01 and ***P<0.001 indicate a statistically significant generation of nitric oxide.
