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Research assistant Katie McCullough holds a mouse in a Washington University lab where doctors are using the mice to study a rare form of autism linked to a mutation in the MYT1L gene Wednesday, Dec. 15, 2021, in St. Louis. (AP Photo/Jeff Roberson) ** FILE **

Research assistant Katie McCullough holds a mouse in a Washington University lab where doctors are using the mice to study a rare form of autism linked to a mutation in the MYT1L gene Wednesday, Dec. 15, 2021, in St. Louis. (AP Photo/Jeff Roberson) ** FILE **

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