Cloned dilemma

Cloned dilemma  dolly, the cloned sheep, has celebrated her fifth birthday. Most other cloned animals aren't so lucky. They rarely reach adulthood. Some die in the process of cloning itself. The unpredictability of cloning seems to arise from some uncertain genes. Researchers based in the us are now beginning to understand the reason behind the low success rate of cloning. The activation of human genes depends on which parent they come from. Which of these so-called

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