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. 2019 Jun 21;2:233. doi: 10.1038/s42003-019-0481-8

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© The Author(s) 2019

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. 4 — Mean relative ¹³C enrichment of microbial biomass lipids measured through phospholipid fatty acid (PLFA) analysis. Since organic matter was enriched with ¹³C and plant photosynthates were depleted in ¹³C, lower PLFA δ ¹³C values suggest that microbes derived a greater proportion of their C from plant photosynthates. Letters denote the results of a Tukey’s HSD test performed on log-transformed data; error bars represent the standard error (p < 0.01, n = 7 biologically independent samples)