WASHINGTON - MARCH 09:  U.S. President Barack Obama finishes signing an Executive Order on stem cell research at the White House March 9, 2009 in Washington, DC. By signing the order, Obama reverses a Bush administration policy restricting U.S funding for embryonic stem cell research that scientists hope will speed the search for cures to major illness. Getty Images logo Getty Images 35 months ago

WASHINGTON - MARCH 09: U.S. President Barack Obama finishes signing an Executive Order on stem cell research at the White House March 9, 2009 in Washington, DC. By signing the order, Obama reverses a Bush administration policy restricting U.S funding for embryonic stem cell research that scientists hope will speed the search for cures to major illness.