FIG 5.

Marker-SNP sharing over time and between individuals shows strain stability and twin sharing in three of four species. Percentage of marker-SNPs shared for all pairwise comparisons, separated by the category of comparison: intra (same person over time), same family (comparisons between twin siblings), and unrelated (comparisons between unrelated people). Shown are the four taxa for which sufficient coverage existed to calculate marker-SNPs. Species are B. adolescentis (A), B. longum (B), B. bifidum (C), and B. animalis (D). Boxplots show median and quartiles, while red diamonds show means. Significance levels are median Wilcoxon rank sum tests after 999 bootstraps to smallest group size. ns, P > 0.05; *, P ≤ 0.05; **, P ≤ 0.01; ***, P ≤ 0.001; ****, P ≤ 0.0001.