http://www.nytimes.com/2016/07/27/science/dolly-the-sheep-clones.html?_r=0
Dolly the sheep, well-known as the first animal cloned from an adult cell, was unfortunately short-lived, developing arthritis early on in life and dying at age 6 (a good bit earlier than expected for an average sheep).
This left scientists wondering whether cloned animals were inherently unhealthy or if Dolly's was a particularly unfortunate case.
According to the research described above, cell cloning has good potential to produce perfectly normal and healthy animals; four clones created from Dolly's cells in 2007 are alive to this day, and are expected to continue living into the next year.
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