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VitD3 supplementation increases phylotype richness in the gastric antrum and duodenum; alpha rarefaction curves of a the gastric corpus, b the gastric antrum, c the duodenum, and d stool. The number of observed species is plotted against the number of sequences per sample. We see an increase in richness in the gastric antrum (P = .004) and a trend in the duodenum (P = .06) but not in gastric corpus (P = .933) or in stool (P = .313). Rarefaction curves also indicate sufficient coverage
