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Dolly, the first ever mammal to be successfully cloned from an adult cell, pictured here with her first lamb, named 'Bonnie,' at the Roslin Institute in Edinburgh. Dolly, who was naturally mated at the end of last year with a Welsh Mountain ram, gave birth to Bonnie early on Monday April 13th, 1998, proving that despite her unusual origins, she is able to breed normally and produce healthy offspring. (KEYSTONE/PA Photos)