Fig. 2.

Distribution of HPV effective genome sizes among original HPV genomes, and HPV genomes in repeat-mask, and homology-mask databases. For our mask strategies, the length of HPV genomes was not changed and we called non-N sequences of HPV genome as the effective genome. In sum, the HPV effective genome length ranged from 7100–8104 bp for original genomes, 7100–7995 bp for repeat-mask genomes and 1061–7698 bp for homology-mask genomes