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The generation of nitric oxide from (a) SNAP and (b) Angeli's salt stimulated by different concentrations of CuSO4. Control experiments in the absence of CuSO4 were conducted in the presence of 30 μM EDTA to chelate any contaminating copper ions. Each point is the mean and error bars indicate the s.e.mean of 5–8 experiments. ***P<0.001 indicates a significant difference from experiments conducted in the absence of CuSO4.
