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. 2019 May 15;10:457. doi: 10.3389/fgene.2019.00457

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Copyright © 2019 Li, Wang, Fu, Zhang, Cao, Wang, Zhang, Li, Chen, Li, Li, Jiang, Sun, Tian, Li and Kang.

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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Degree of blackness and melanin content of breast muscle tissue. (A) Breast muscle blackness. (B) Melanin content of breast muscle tissue. (C) Analysis of the correlation between the melanin content and the degree of blackness of breast muscle tissue. In x-axis, the C represents the control group, and the TI-TV represents test groups I-V, respectively. Data are expressed as mean ± SD (n = 60). The small letters a, b, etc., on the top of each bar represents statistical significance. Data with different small letters on each bar are statistically significant (P < 0.05), while data with the same letters are not statistically significant (P > 0.05).