Psychologist Geraldine Dawson says, "What is meaningful is that we have found evidence for two genetic subtypes of autism, male versus female and early versus late onset." Researchers scanned the DNA of 169 families that had at least two siblings who met the strict criteria for autism. They also scanned the DNA of another 54 families that also included members who had less severe forms of autism, such as Asperger syndrome. child-autism-parent-cafe.com
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