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. 2021 Nov 18;7:81. doi: 10.1038/s41522-021-00254-z

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — The figure compares samples in preservative (P), or not (No P), or mock samples. a DNA quantity and quality post-extraction; *p < 0.05, linear mixed effect model. b Sequencing depth after processing in QIIME2; not significant, linear mixed effect model. c 16S rRNA gene concentration in the two sample types; not significant, linear mixed effect model. Center line on plots indicates median.