US President Barack Obama has lifted restrictions on federal funding for research on new stem cell lines. Mr Obama signed an executive order in a major reversal of US policy, pledging to "vigorously support" new research.
Ex-President George W Bush blocked the use of any government money to fund research on human embryonic stem cell lines created after 9 August 2001.
Friday, Apr 18th
Last update09:15:21 PM GMT
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