"An undated handout file photo shows ""Otzi"", Italy's prehistoric iceman. Scientists examining the remains of ""Otzi,"" Italy's prehistoric iceman who roamed the Alps some 5,300 years ago, said on May 2, 2012 they have isolated what are believed to be the oldest traces of human blood ever found. REUTERS/Handout/Files. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS"
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