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Average unweighted UniFrac distances between LBW infants (present study) and healthy adults (references 1, 2, and 5; see Materials and Methods) for oral, skin surface, and stool microbiota (250 sequences per sample). Values that are significantly different by Tukey’s posthoc tests are indicated by bars and 4 asterisks (P < 0.0001). Error bars represent 95% confidence intervals.
