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NO generation from the films upon storage in the dark at 4 °C after (a) 13 and (b) 57 days: (5.70 ± 0.06 and 3.20 ± 0.05)×10−10 mol cm-2 min-1, respectively. The films were then kept in the dark at room temperature and after (c) 297 days were still generating NO at (0.80 ± 0.02)×10−10 mol cm-2 min-1, averaged over 10 min of NO release.
