Table 1.

Analysis of PolII-binding sites on the human X chromosome

	PolII peaks called (QuEST)a	PolII-occupied heterozygous SNPsb
Total	168	385
TSS ±500 bp	120	37
Intragenic	138	257
Extragenic	30	128
<5 kb from genes	9	60
5–30 kb from genes	15	17
>30 kb from genes	6	51

^aNon-allele-specific PolII peaks called by Quest software (64) as a composite of the two X chromosomes.

^bPolII occupancy at heterozygous sites; sites with minimum of five reads at one or the other allele were considered.