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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/).
SEM images of CalliSpheres® before/after IDA loading. Scale bars in main the pictures: 50 μm for 50~150 μm CalliSpheres®, and 100 μm for 100~300 μm and 300~500 μm CalliSpheres®.