The human microbiome. Microorganisms cover the human body. Examination of the microbial communities using DNA sequencing methods revealed many previously uncharacterized species. The Venn diagrams represent populations of related species as determined by DNA sequence comparisons. The populations present on different body surfaces are largely distinct.
[Adapted from www.nature.com/nature/journal/v486/n7402/fig_tab/nature11234_F1.html]