Researchers create new stem cell screening tool

Stem cell research is the next great leap in medicine. In the future, new tissue grown in a laboratory could replace a failing heart, or new cells take the place of damaged cells in the brain. Rather than using stem cells from embryonic sources, which opens difficult ethical and complicated scientific issues, scientists have been looking to adult human stem cells, culled from a person's own body. Adult stem cells are now being cultivated from various tissues in the body -- from skin, bones and even wisdom teeth.