CHICAGO (Reuters) - U.S. researchers have used a new gene editing technique to trim away potentially harmful virus genes that have impeded the use of pig organs for transplants in humans.br clear='all'/img width='1' height='1' src='http://reuters.us.feedsportal.com/c/35217/f/654220/s/4a9c48c1/sc/14/mf.gif' border='0'/div class="feedflare"
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