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. 2019 Oct 23;9:369. doi: 10.3389/fcimb.2019.00369

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Copyright © 2019 Sun, Chen, Lin, Xu, He, Ji, Bian, Shen, Li, Liu, Dong, Tang, Pei, Yang, Lu, Guo and Xiao.

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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Comparison of the α-diversities of the gut microbiomes in the RA group and control group using the Chao index (A) and Sobs index (B). Chao1 is an index that estimates the number of OTUs contained in a sample. It is commonly used in ecology to estimate the total number of species. Sobs is the observed number of OTUs. ^***p < 0.001.