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. 2021 Sep 6;43(5):2441–2453. doi: 10.1007/s11357-021-00429-8

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Human-macaque clocks applied to select human tissues. Leave-one-human sample-out (LOHO) cross fold cross-validation estimates of the human-macaque clock for (A, C) chronological age and (C, D) relative age, respectively. (A, B) Human blood samples. (C, D) Human skin samples. Each panel reports the sample size (in parenthesis), correlation coefficient, and median absolute error (MAE)