Figure 2. Microbiota richness and maturity relative to age in the different groups.

(a) Number of species-like phylotypes. (b) Score based on 24 age-associated genera (Supplementary Table 2). Asterisks indicate significance of the difference to the control group ‘C'. *P<0.05, **P<0.01 and ***P<0.001, estimated using linear models. Mean values are shown and the error bars show the s.e. values. The number of samples in both panels is 257 (Supplementary Table 1).