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Scheme showing possible structures in the equilibrium between aldehyde (red) and hydroxylysine (blue) residues in collagen. The imine, hemi-aminal, and oxazolidine are possible crosslinks that may exist in equilibrium with each other. None of these crosslinks have been observed in native collagen to date, possibly because of their low abundance and that current NMR spectrometers do not yet have the required sensitivity.
