New cellular research may hold the key to replacing diseased or damaged tissues in humans. This breakthrough, while offering vast medical benefits, has also sparked an intense ethical debate. Following an interview with the biotechnology company that funded this research , two medical ethicists debate the concept. If animation does not play or you do not have Flash 3, please click here . An interview with the company that funded the cell research .
Brain cells do indeed multiply.
The beginning of Dolly, a cloned sheep. More NewsHour Health and Science coverage. University of Wisconsin features the discovery. Graphics of embryonic stem cells. The full report in Science Magazine A Geron Special Report.