For some reason I thought it said conjoined instead of identical and I was wondering how they did it…

This is the best summary I could come up with:

To scientists, twins like Sam and John pose an important question: How can a disorder that is known to be highly genetic look so different in siblings who share the same genome?

It also might help “modify the trajectory” of autistic children experiencing speech and language delays, or difficulty with social communication.

Sam and John are spending the weekend with their mom, Kim Leaird, at the family’s apartment in West Tisbury, a small town on Martha’s Vineyard.

And when Sam ran track and cross country in high school meets, he’d see his brother at the finish line, “jumping up and down because he was so happy.”

When asked to name his favorite episode of Sesame Street, John blurts out a series of words: “Abby makes the seasons change.”

Now that Sam is off at college, he worries about his brother, whose limited speech and flapping arms can make him the target of insults and ridicule.

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