Figure 2.

Rarefaction curves were used to estimate richness (in this case the number of taxa at a 3% dissimilarity level) among nasopharynx, saliva, dominant hand and feces from healthy Chinese undergraduates. The vertical axis shows the number of OTUs that would be expected to be found after sampling the number of tags or sequences shown on the horizontal axis.

Ling et al. BMC Genomics 2013 14:390   doi:10.1186/1471-2164-14-390
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