Researchers at University of Pennsylvania have discovered stem cells in the esophagus of mice that were able to grow into tissue-like structures and when placed into immune-deficient mice were able to form parts of an esophagus lining. The investigators report their findings online on Monday in the Journal of Clinical Investigation. "The immediate implication is that we'll have a better understanding of the role of these stem cells in normal biology, as well as in regenerative and cancer biology," says senior author Anil Rustgi. "Down the road, we might use these stem cells in replacement therapy for diseases like gastroesophogeal...