Brooke Greenberg is a 20-year-old woman living with the mind and body of a toddler. She stopped aging when she was 2.
Her condition is so rare, even doctors have difficulty explaining it. But learning more about her genetic code may help them solve other medical mysteries.
Dr. Drew On Call airs Monday through Wednesday on HLN at 9 p.m. ET. Follow the show on Facebook and Twitter @DrDrewHLN.
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