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Decay of the MIS in fingernail clippings exposed to ambient air (A) or carbon dioxide (B) over 60 min following cutting. Under air, the MIS-doublet undergoes rapid fading as seen by the decrease the intensity of the peak at 3520 G, with some minor fading of the MIS-broad as seen in the peak centred at 3460 G. However, under carbon dioxide the fading is dramatically slowed for all the MIS spectral components. The peak at 3545 G is the Bruker reference standard.
