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Alpha diversity of human gut microbiome across lifestyles. Boxplot of Phylogenetic diversity analysis (PD) between hunter-gatherers, agricultural, agropastoral, pastoral, and urban populations. Asterisks denote statistical significant differences given by Wilcoxon rank-sum test (*p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001).
