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Scientists See Defects in Lab-Grown Stem Cells

Scientists have uncovered problems that may limit the usefulness of human embryonic stem cells. After several months of growing in a lab, the cells exhibit genetic abnormalities. Scientists will have to address that issue before stem cells can be used to treat disease.

Copyright 2005 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.
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