"We have to take account, for moral purposes, of the duty of beneficence, the duty to come to the aid of those who suffer if we can do so without unreasonable burden," says Louis Guenin, a lecturer on ethics in science at Harvard Medical School.

David Masci, a senior research fellow at the Pew Forum on Religion & Public Life, discusses religious, ethical, and moral perspectives on lifting federal funding limits on embryonic stem cell research.