Aug. 23, 2000: The National Institutes of Health issue guidelines that allow federal funding of embryonic stem-cell research. Former President Bill Clinton supports the guidelines.
February 2001: The month after taking office, President George W. Bush requests a review of the NIH funding guidelines and puts a hold on federal funds for stem-cell research.
July 18, 2001: Sen. Bill Frist (R-TN) and Sen. Orrin Hatch (R-UT), a vocal abortion opponent, call for limited federal funding for stem-cell research.
July 29, 2001: House Speaker Dennis Hastert (R-IL) and other Republican House leaders come out in opposition to federal funding for research.
Aug. 9, 2001: President Bush announces his decision to limit funding to a few dozen lines of embryonic stem cells in existence at that date. Many of the approved lines later prove to be contaminated, and some contain genetic mutations, making them unsuitable for research. (MORE: 'Bush Limits Funding for Stem-Cell Research')
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