When President Obama lifted restrictions on federal funding of human embryonic stem cell research in March, many scientists hailed the move as a long-awaited boost for one of the most promising fields of medical research.
Since then, however, many proponents have concluded that the plan could have the opposite effect, putting off-limits for federal support much of the research underway, including work that the Bush administration endorsed. "We're very concerned," said Amy Comstock Rick, chief executive of the Coalition for the Advancement of Medical Research, which has been leading the effort to free up more federal funding for stem cell research. "If they don't change this, very little current research would be eligible. It's a huge issue."