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Boxplots of A) Chao1 indices (p = 0.01) and B) Shannon indices (p = 0.22) for 12M infant gut microbial samples stratified based on timing of human milk exposure. Chao1 is an estimator of the species richness in a community, and the Shannon index considers both evenness and abundance to produce a measure of alpha diversity. Boxplots with shared superscript letters are not significantly different from one another. Abbreviations: 6M: 6 months, 12M: 12 months, HM: Human Milk.
