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Old before her time?
Because Dolly's genetic material came from a 6-year-old sheep, questions have always been asked about her "true" age.
In 1999, some of the scientists who created Dolly studied her genetics. They found that structures in her cells called telomeres were slightly shorter than would be expected in a sheep of her age conceived naturally - so in a way Dolly's DNA was 'older' than her body. Scientists realised then that Dolly might die young.
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