Abstract One of the two X-chromosomes in female mammals is epigenetically silenced in embryonic stem cells by X-chromosome inactivation. This creates a mosaic of cells expressing either the maternal or the paternal X allele. The X-chromosome inactivation ratio. the proportion of inactivated parental alleles. https://www.spidertattooz.com/1969-Ford-Mustang-Black-Metallic-with-Pink-Stripes-and-Wheels-Pink-Slips-Series-1-32-Diecast-Model-Car-by-Jada/