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Figure 2. Plots of the numbers of different operational taxonomic units (OTUs) in saliva a ( ) and plaque (B) as a function of the number of sequences sampled, also known as rarefaction curves and the relative abundance of the OTUs in saliva (C) and plaque (D). The 0% curve is based on all unique sequences (N = 10,754 in saliva, N = 18,244 in plaque); the 3%, 6%, and 10% curves contain OTUs with differences that do not exceed 3%, 6%, or 10%, respectively. The steepness of the curves (A,B) indicates that a large fraction of the species diversity has not yet been sampled. (C,D) The relative abundance of the OTUs in saliva (C) and plaque (D). The x-axis indicates the individual OTUs, ranked according to their relative abundance (high to low). The y-axis indicates the cumulative abundance of the OTUs. As can be observed, for plaque as well as saliva, the 1000 most abundant OTUs represent 90–95% of all sequences.
J DENT RES, Vol. 87, No. 11,
1016-1020 (2008)
DOI: 10.1177/154405910808701104
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