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. 2014 Nov 17;9(11):e112966. doi: 10.1371/journal.pone.0112966

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© 2014 Gong et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Statistical analyses were performed at 95% condence with IBM SPSS Statistics 11.0 (SPSS Inc., Chicago, USA). Values with an asterisk represented a significant differe- nce at P<0.05. The fiber microstructure of Z263 (C I) and Z128 (C II) was observed under a microscope (×3000 and ×2500, respectively).