The Probability to Initiate X Chromosome Inactivation Is Determined by the X to Autosomal Ratio and X Chromosome Specific Allelic Properties. - Monkhorst, Kim; de Hoon, Bas; Jonkers, Iris; Achame, Eskeatnaf Mulugeta; Monkhorst, Wouter; Hoogerbrugge, Jos; Rentmeester, Eveline; Westerhoff, Hans V.; Grosveld, Frank; Grootegoed, J. Anton; Gribnau, Joost (PLoS ONE, 2009)