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A group of people with connections to two cities in North Carolina and Alabama have been diagnosed with a rare eye cancer called ocular melanoma. Medical experts are trying to determine the cause of the cases. Karen Bleier/AFP/Getty Images hide caption

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Karen Bleier/AFP/Getty Images

Hairdressers spend more time looking at the tops of heads than anyone else, so are well positioned to spot suspicious skin changes. CommerceandCultureAgency/Getty Images hide caption

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CommerceandCultureAgency/Getty Images

Jim Allison in his lab at the University of Texas MD Anderson Cancer Center in Houston. Scott Dalton for NPR hide caption

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Scott Dalton for NPR

A Scientist's Dream Fulfilled: Harnessing The Immune System To Fight Cancer

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