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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 (http://creativecommons.org/licenses/by/4.0/).
Schematic cross-section of P. margaritifera mollusk shell with marked areas of SEM observations (a) and corresponding SEM/BSE microstructure images acquired from the section perpendicular to ND (b) and LD (c).