Table 3.

ERVs with a p53 site enriched in PET loci

Locus category	No. of loci	Loci with p53 sites	Loci with p53 sites in ERV
PET1 (low confidence)	61,160	1,722	150 (8.7%)
PET2 (medium confidence)	1,452	281	67 (23.8)
PET3+ (high confidence)	327	250	89 (35.6)

PET1, PET2, and PET3 + were defined by ref. 16 as potential p53 binding regions with different confidence. The number of loci in each category is listed in the second column. The third column contains the number of loci that have a predicted, near-perfect p53 site. The last column indicates the number and fraction of these predicted p53 sites residing in ERVs.