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. 2015 Feb 13;10(2):e0117240. doi: 10.1371/journal.pone.0117240

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© 2015 Sroga et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 2 — A. Identification of PEN (shown by red arrow) in the glucosylated human cortical bone samples. B. Identification of PEN (shown by red arrow) in the ribosylated human cortical bone samples. C. The UPLC chromatogram with the peak of ProOH (shown by red arrow) used for determination of collagen contents. Similar amounts of the samples were injected to the column. Notably, the chromatogram obtained from the analysis of the ribosylated sample contains several peaks that are not present in the glucosylated sample.