A mouse kept coming back in the lab for 20 years, generation after generation, and at first almost nothing seemed wrong. Then the copies started carrying a hidden burden that researchers could no longer ignore. In a lab at the University of Yamanashi, one mouse line kept coming back in a form that looked almost unchanged. Researchers began with a single female donor and used her cells to make a clone, then repeated the same process with the clone’s cells, a... [4696 chars]
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