Figure 2.

Allele-specific PolII occupancy on the X chromosome in GM12878. (A) Distribution of heterozygous sites with at least 10 mapped PolII ChIP-seq reads on the X chromosome, displayed as the proportion of sites on the Xi. XAR, X-added region; XCR, X-conserved region; PAR, pseudoautosomal region. (B) PolII occupancy on the X^m versus X^p chromosomes. Dashed axes represent 95% skewing (i.e. monoallelic occupancy) observed in the GM12878 cell line. Solid diagonal represents equal PolII occupancy on Xi and Xa.