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. 2020 Nov 15;13(22):5145. doi: 10.3390/ma13225145

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Chemical structure of (a) Polylactic acid (PLA), (b) Polyhydroxyalkanoate (PHA), (c) Poly butylene succinate (PBS), (d) Polyamide (PA). Adapted from [120,121,122,123].