Fig. 2.

Average pairwise bacterial community similarity between left and right hands from the same individual (circles) and between hands from different individuals (squares) as measured by using the unweighted UniFrac similarity index (bottom axis, open symbols) or the percentage of phylotypes that are shared between pairs (top axis, filled symbols). Average pairwise values and 95% confidence intervals are shown. For these analyses, 2,500 sequences were randomly selected per sample, and only those samples represented by >2,500 sequences were included (n = 51 and 5,100 pairwise comparisons for intraindividual comparison and interindividual comparisons, respectively).