Fig. 3.

Number of reads corresponding to papillomaviruses in metagenomes from the Human Microbiome Project and a study of the upper reproductive tract. Read counts were divided by sample counts and normalized to 1×10⁶ reads. (a) Bars show the classified read counts separated into four general body sites, while the total numbers of reads for each metagenome are plotted with dots above each accession. (b) The number of metagenomes where papillomavirus sequences (two or more reads) are found.