Luzzatto L, Usanga E A, Bienzle U, Esan G F, Fusuan F A
Science. 1979 Sep 28;205(4413):1418-20. doi: 10.1126/science.472761.
In each of six family members who were heterozygous at the X-linked locus for glucose-6-phosphate dehydrogenase, only one or the other of the two alleles at that locus was almost exclusively expressed. The data are consistent with evidence that X-chromosome inactivation is a random process that may be followed by selection for one of the two resulting cell types on the basis of an unknown gene, which is located on the X chromosome and which can affect the rate of proliferation of hemopoietic cells in humans.