Science: Conquering Inherited Enemies

Doctors stand on the brink of a genetic revolution

When Chad Wilkinson, 10, is not strapped down in his padded bed, he must be bound to his wheelchair. Otherwise he would try to chew off his fingers or bite his arms. All his teeth have been removed so that he cannot gnaw through his lips and tongue. His body is racked with palsy, and he is mentally retarded. His parents can no longer take him to restaurants in their hometown of Allen, Texas, because he might yell out abusively or spit food at other diners. "You always pray for a miracle," says his mother Valda. "But you don't hold out...

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