The basis for the discordant expression of this d novo mutation in the twins was investigated by studying their X inactivation status .
the basis for the discordant expression of this d novo mutation in the twins was investigated by studying their x inactivation status .
O O O O B-other_name I-other_name O O B-other_name I-other_name I-other_name O O B-multi_cell O O O O O B-other_name I-other_name O O