We examined the transcriptional activity of ring X chromosomes lacking XIST expression ( XISTE- ) , from three females with severe phenotypes .
we examined the transcriptional activity of ring x chromosomes lacking xist expression ( xiste- ) , from three females with severe phenotypes .
O O O B-other_name I-other_name O O B-DNA_molecule I-DNA_molecule O B-DNA_domain_or_region O O O O O O O B-multi_cell O O O O