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. 2021 Aug 6;12:720101. doi: 10.3389/fmicb.2021.720101

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Copyright © 2021 Cron, Macalady and Cosmidis.

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 images of sulfur particles associated with EPS in Sulfurovum-dominated streamer biofilms. Samples include (A) PC1647 and (B–F) PC1718. Red arrows point to bipyramidal S(0) crystals and white arrows point to S(0) spheroids. (A) shows an example of a chain formed by fused bipyramidal S(0) crystals (black arrow).