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Five cloned pigs,whose organs are much less likely to be rejected by a patient,have been born in the U.S. More than 62,000 people in the U.S. alone are waiting to  possess  donated hearts,lungs and so on.The number of human donors falls far short of  distance  .Pig organs are of a(n)  beneficial  size to human organs,and some scientists hope they might be used to help meet the  condition  .But previous attempts to transplant pig tissue into humans have  [MASK]  .