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. 2016 Nov 21;37(1):51–60. doi: 10.1007/s10875-016-0347-5

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 4 — Correlation between TREC (a) and KREC (b) levels within all 896 twin pairs. Each point represents one twin pair, where the TREC value for twin 1 (x axis) is plotted against the TREC value for twin 2 (y axis) (a). KREC levels for each pair are similarly depicted (b). Overall, there was poor correlation between specimen pairs, with a calculated Spearman correlation coefficient (R _s) of 0.6 for TREC and 0.57 for KREC (p < 0.0001)