Leprosy is one of the world’s oldest and most persistent diseases but the bacteria that cause it may also have the surprising ability to grow and regenerate a vital organ. Scientists have discovered that parasites associated with leprosy can reprogram cells to increase the size of a liver in adult animals without causing damage, scarring or tumors. The findings suggest the possibility of adapting this natural process to renew aging livers and increase healthspan--the length of time living disease-free--in humans. Experts say it could also help regrow damaged livers, thereby reducing the need for transplantation, which is currently the only curative option for people with end-stage scarred livers.
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