9 March 2009 - President Barack Obama signs an executive order reversing federal opposition to embryonic Stem Cell research.
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Bill Frist (R-TN) and Sen. Orrin Hatch (R-UT), a vocal abortion opponent, called for limited federal funding for embryonic stem-cell research....
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19 July 2006 - President George W. Bush vetoes House Resolution 810 Stem Cell Research Enhancement Act, a bill that would have reversed the Dickey Amendment which made it illegal for federal money to be used for research where stem cells are derived from the destruction of an embryo.
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2001–2006 - U.S. President George W. Bush signs an executive order which restricts federally funded stem cell research on embryonic stem cells to the already derived cell lines.
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