Proportion of reads mapped to 2780 reference genomes grouped into three categories of references.

<p>Reference genomes found in the same body site as the metagenome sample are in Green, those found and isolated from a different body site are in Red, and those references that are not known to be affiliated with humans are in Blue. The percentage of all reads mapped is shown along the y-axis in an accumulation curve. The five major body sites are shown with the reference genomes are along the x-axis in decreasing read-mapping abundance for each of the three categories of references.