Article: Scientists begin to trace autism's genetic roots.

Byline: Tina Hesman

ST. LOUIS _ Most 11-year-olds don't react to their first trip to the zoo the way Alex Richie did.

"I shouldn't have come. I shouldn't have come."

The Ferguson, Mo., boy's family hears that whenever Alex goes someplace new.

A visit to IHOP would have been all right. Alex had been there.

But even Disney World was traumatic. They don't serve Dr. Pepper there.

"Alex wants out of his room and he wants to enjoy life," said his mother, Jessica Cooper, 32.

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