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Hierarchical clustering (vertical axis) of the mean relative abundances for an aggregation of the 10 most-abundant bacterial genera from each cohort in (A) infant feces and (B) milk. ETR, rural Ethiopia; ETU, urban Ethiopia; GBR, rural Gambia; GBU, urban Gambia; GN, Ghana; KE, Kenya; SP, Spain; SW, Sweden; PE, Peru; USC, California (United States); USW, Washington (United States).
