Enlarge Image Missing. Researchers have uncovered the mutation behind a rare disease that leaves people without fingerprints. Credit: Nousbeck et al., The American Journal of Human Genetics (2011) In 2007, a Swiss woman in her late 20s had an unusually hard time crossing the U.S. border. Customs agents could not confirm her identity. The woman's passport picture matched her face just fine, but when the agents scanned her hands, they discovered something shocking: she had no fingerprints. The woman, it turns out, had an extremely rare condition known as adermatoglyphia. Peter Itin, a dermatologist at the University Hospital Basel...