Figure 6.

Xi gene expression in multiple cell lines. Genes associated with PolII in GM12878 (shown on vertical axis) were tested for expression in GM12878 (open symbols) and additional heterozygous cell lines (closed circles). Error bars represent standard deviation of the mean between biological replicates. Expression of ZNF41 has been tested previously in ten human cell lines (29). It was subject to inactivation in nine informative cell lines (not shown in the figure) and escaped inactivation in one cell line (designated by an asterisk).