Embryonic stem cell research, which uses special cells found in three- to five-day-old human embryos to seek cures for a host of chronic diseases, has sparked a major moral and political debate in the United States. In the 10 years since University of Wisconsin scientists announced they had harvested potentially life-saving cells from surplus embryos donated by fertility clinics, the ethical dilemma presented by the studies has absorbed activists on both sides of the issue and has risen to the top of state and federal political agendas. Source: Pew Research
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