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We might be adding milk from a cloned cow to our coffee. Scientists, policymakers and others convene in Dallas this week to debate the possibility. That's because farmers and biotech firms are already cloning prize livestock. A National Academy of Sciences report says research vouches for the safety of by-products from cloned animals but calls for more study. If cloned animals end up in the food supply, will consumers know it? Probably not, says one of the report's authors, because "if companies can show that their milk or meat is substantially equivalent to those from noncloned animals, the law does not require them to label it."