CHICAGO (Reuters) - U.S. researchers have used a controversial cloning technique to make new, healthy, perfectly matched stem cells from the skin of patients with mitochondrial diseases in a first step toward treatment for these incurable, life-threatening conditions.br clear='all'/img width='1' height='1' src='http://reuters.us.feedsportal.com/c/35217/f/654220/s/48267fe4/sc/14/mf.gif' border='0'/div class="feedflare"
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