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Senior Architectural Systems’ stunning PURe® FOLD patio aluminium doors have helped add character to the Yorkshire home of USA Today best-selling novelist Susan Stephens by providing the perfect setting to relax with a good book. In early embryonic development, an oversight can take place giving the embryo some cells with two X chromosomes and several with three X chromosomes. Luckily, both types of cells continues to divide and since not every cells have the abnormal amount of X chromosomes the female is only going to experience mild, if any, symptoms.