Fig. 3 Postnatal assembly of the humanized gut microbiota. Postnatal assembly of the humanized gut microbiota. (A) Rarefaction curves measuring bacterial diversity in the fecal communities (species-level phylotypes defined by ≥97% identity). The curves are based on V2 16S rRNA gene sequences obtained from mice before weaning (P14) and after weaning (P28). Values are mean ± 95% confidence interval. (B) Taxonomic distribution [RDP level 3 (27)] of the gut microbiota sampled from mice from P14 to P85. Values represent the average relative abundance across all samples within a given group. Peter J. Turnbaugh et al., Sci Transl Med 2009;1:6ra14 Copyright © 2009, American Association for the Advancement of Science