The dangers of cloning and the promise of regenerative medicine [electronic resource] : hearing before the Committee on Health, Education, Labor, and Pensions, United States Senate, One Hundred Seventh Congress, second session, on examining cloning research, focusing on the clarification of how stem cell research, or therapeutic cloning, differs from human reproductive cloning, and the ethical and public -policy issues related to both, and related issues of S. 1853 to ban human cloning while protecting stem cell research, March 5, 2002.