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. 2019 May 8;10:526. doi: 10.3389/fphys.2019.00526

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Copyright © 2019 Flück, Kramer, Fitze, Kasper, Franchi and Valdivieso.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Interaction effects between the phenotype and the rs2104772 (TNC) gene polymorphism on muscle composition. Bar graph of the mean and standard deviation for the investigated muscle characteristics for the distinct rs2104772 genotypes in the two athlete types. For comparison, the values in the non-athletes are shown as well, but without the indication of statistically significant differences. (A) capillary length density, (B) fiber MCSA. ^∗p < 0.05 and ^∗∗∗p < 0.001 for the indicated differences.