[L] last year, Kevin Sinclair, a development biologist at the University of Nottingham, published an article on several clones, including the four "sisters" of Dolly, which were created from the same cell line as Dolly and lived until the age of eight (approximately 70 in human years). They were quite healthy for their age.
[A] After his death in 2003, Dolly's bones were delivered to the National Museum of Scotland . Sinclair's team was allowed to study them, along with the bones of Megan and Morag, two cloned sheep of non-adult cells that were prototypes of Dolly, and Bonnie, daughter of Dolly's naturally conceived.
A team of veterinarians obtained X – Bone strips for signs of arthritis. Megan and Bonnie, who had died at the ripe age of 13 and nine years, respectively, did have signs of arthritis, which was normal for their age. Megan, who had died at age four in a previous outbreak of the same lung virus that killed Dolly, did not. Even Dolly's knee showed no signs of arthritis.
[T] The general data set of Megan, Morag, and Bonnie, as well as Dolly's older sister clones, suggest that arthritis is not more common among clones than ordinary sheep. Fears about premature aging of clones can be greatly exaggerated.
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