https://www.psychologytoday.com/blog/hormones-and-the-brain/201603/curable-brain-disorder

Rett syndrome is rare, but that doesn’t make it uninteresting. It’s the result of a mutation in one of the genes on the X chromosome (it’s called MeCP2). Whilst the MeCP2 protein is found all over the body, there’s much more of it in the brain. It acts by modifying the action of other genes: an epigenetic event. Although females have two X chromosomes, one is inactivated in each cell, so if they h...
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