Figure 2. (A) Venn diagram showing the numbers of operational taxonomic units (OTUs) between NCG and OG. (B–E) Alpha diversity of samples from the NCG and OG groups. (B) Rarefaction curves with Chao1 index. (C) Rarefaction curves with Good’s coverage index. (D) Violin plot of Shannon index. (E) Violin plot of Simpson index. Data are represented as mean ± standard error of mean. n = 7; *P < 0.05, **P < 0.01, ***P < 0.001, and ****P < 0.0001; ns, non-significant.