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. 2017 Mar 24;7:45170. doi: 10.1038/srep45170

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Structural model of PLA SC (a), molecular arrangement (b) and helical direction of PLA chains (b) projected on the plane normal to the chain axis. The arrows indicate the relative directions of PLA helices. Panels (a) and (b) are Reprinted from ref. 18, T. Okihara, et al., J. Macomol Sci. Part B: Phys., vol. B30, 735-736, Crystal structure of stereocomplex of poly(L-lactide) and poly(D-lactide), pp. 119–140, Copyright (1991), with permission from Taylor & Francis. In panels (a) and (b), L-PLA and D-PLA are abbreviated as PLLA and PDLA, respectively. In panel (a), the arrows are added to original figure and in panel (b) a line between L-PLA and D-PLA is added.