Born without fingerprints

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Adermatoglyphia is a very rare genetic condition causing you to be born without fingerprints. In 2011, a small group of researchers pinpointed the genetic mutation behind it. One of them, dermatologist Peter Itin, was drawn to the mystery after he was contacted by a Swiss woman who found trouble at the US border when immigration agents couldn't take her prints… because she doesn't have any. "Adermatoglyphia: The Genetic Disorder Of People Born Without Fingerprints" (Smithsonian)