Rett Syndrome (RTT) is a rare and severe X-linked developmental brain disorder that occurs primarily in females. with a ratio of 1:10. 000. De novo mutations in the Methyl-CpG Binding protein 2 (MECP2) gene on the long arm of X chromosome are responsible for more than 95% cases of classical Rett. https://unitedssports.shop/product-category/clothing-mens-tops-long-sleeve/