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Team Clones Human Embryo in Korea

South Korean and U.S. researchers say they have successfully cloned a human embryo and extracted embryonic stem cells from it. The experiment, reported in the journal Science, is the first instance of cloned human stem cells -- an important step toward therapeutic cloning, in which patients' own replacement tissue would be generated to treat them. NPR's Joe Palca reports.

Copyright 2004 NPR

Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.