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. 2017 May 2;7:1297. doi: 10.1038/s41598-017-01272-8

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Indicators of aging progression. Correlation of aging duration with (A) K value and (B) L value, represented by the ratio of leucine ([Leu]) to creatine ([Cr]). (C) Correlation between pH and [Car H-2], represented by the chemical shift of the ¹H signal at C-2 of the imidazole ring of carnosine (Car). The [Car H-2] value in the observed pH range shows a linear correlation with pH, although overall pH profile of [Car H-2] is sigmoidal⁴². The plots are color-coded according to aging duration (week): 2, blue; 4, green; 6, light green; 8, yellow; and 10, red.