WASHINGTON (Reuters) - Research involving genetic modification of human embryos, though controversial, is essential to gain basic understanding of the biology of early embryos and should be permitted, an international group of experts said on Wednesday.br clear='all'/img width='1' height='1' src='http://reuters.us.feedsportal.com/c/35217/f/654220/s/49b79f37/sc/32/mf.gif' border='0'/div class="feedflare"
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