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Microscopic View Of A Two Cell Mouse Embryo, A Result Of A New And Relatively Simple Cloning Technique Discovered By Scientists At The University Of Hawaii July 1998. The Scientists Have Created Dozens Of Cloned Mice, Marking The First Documented Cloning Of Adult Mammals Since Researchers In Scotland Announced The Birth Of Dolly The Sheep Last Year. (Photo By Getty Images)

Microscopic View Of A Two Cell Mouse Embryo, A Result Of A New And Relatively Simple Cloning Technique Discovered By Scientists At The University Of Hawaii July 1998. The Scientists Have Created Dozens Of Cloned Mice, Marking The First Documented Cloning Of Adult Mammals Since Researchers In Scotland Announced The Birth Of Dolly The Sheep Last Year.  (Photo By Getty Images)