Supplementary Information for

San Roman AK, Godfrey AK, Skaletsky H, Bellott DW, Groff AF, Harris HL, Blanton LV, Hughes JF, Brown LG, Phou S, Buscetta A, Kruszka P, Banks N, Dutra A, Pak E, Lasutschinkow PC, Keen C, Davis SM, Tartaglia NR, Samango-Sprouse C, Muenke M, Page DC

The human inactive X chromosome modulates expression of the active X chromosome