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Cloning Mice Shows Triple Mutation Rate, Study Finds

3/27/2026

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Story summary
  • A 20-year study led by Teruhiko Wakayama of Yamanashi University shows cloning mice accumulate mutations at three times the rate of naturally bred mice.
  • After 58 generations, all clones died shortly after birth, though they appeared healthy.
  • The study suggests cloning may induce mutations and raises concerns for agriculture and conservation, while noting that the mutation rate remains relatively low and challenges persist.