Rett syndrome, a form of autism, is a disorder where normal early development is followed by loss of purposeful use of the hands, slowed brain and head growth, and gait abnormalities.

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This is an accurate description of Rett syndrome, a disorder that primarily affects girls and is caused by a mutation in the MECP2 gene. It is not considered a form of autism, but it can result in similar symptoms such as social and communication deficits.

Rett Syndrome, a Form of Autism, Is a Disorder Where