U.S. scientists grow nerve cells from umbilical stem cells: What could be more tragic than a woman in her prime, trapped in a chronic, unpredictable and progressive disease of the central nervous system that causes her to suffer from constant pain, spasms and tremors, incontinence, constipation, memory loss, difficulty concentrating, anxiety, depression—and eventually, paralysis and blindness?
Or a young man suddenly and fully paralyzed by a spinal cord injury from a violent attack or accident?
