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. 2020 Jul 31;11:1705. doi: 10.3389/fmicb.2020.01705

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Copyright © 2020 Grande, Sisto, Puca, Carradori, Ronci, Aceto, Muraro, Mincione and Scotti.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Scanning electron microscopy analysis of SUNCs. Magnification: 85,000× (scale bar: 10 μm–15 kV). Spots 1, 2, and 3 revealed different distribution of elements in the sample-different phases according to the SEM elemental analysis.