Scientists tried to clone mice indefinitely – and made a grave discovery

Scientists tried to clone mice indefinitely – and made a grave discovery

Scientists cloned 1,206 mice from one female donor over 20 years to test the limits of cloning

Can you clone a clone forever? Landmark 20-year study reveals horrifying verdict

Sign up for our free Health Check email to receive exclusive analysis on the week in health Get our free Health Check email Get our free Health Check email A two-decade study into cloning has revealed a fundamental flaw in the technology, demonstrating that repeated duplication leads to an accumulation of fatal genetic mutations. Researchers in Japan generated 1,206 cloned laboratory mice from a single female donor between 2005 and 2025. Initial…