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Selection of IgA-coated bacteria. Healthy lean (n = 10) and obese people with metabolic syndrome (n = 10) were given vancomycin for seven days. Vancomycin changed the relative abundance of several intestinal bacteria (a, d, g, j, m, p). Bacteria were differentially coated with IgA before (b, e, h, k, n, q) and after treatment (c, f, i, l, o, r). Statistical analysis was performed using Wilcoxon matched-pairs signed-rank test (a): *p < .05, **p < .01, ****p < .0001
