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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 (https://creativecommons.org/licenses/by/4.0/).
(a) Chitin structure; (b) Chitin forms (Arrows represent the conformation of the polymer strand; black arrows show the parallel arrangement of chains; blue arrows show antiparallel arrangement of chains.).