It's a busy morning in the cloning laboratory of the big-city hospital. As always, the list of people seeking the lab's services is a long one--and, as always, it's a varied one. Over here are the Midwestern parents who have flown in specially to see if the lab can make them an exact copy of their six-year-old daughter, recently found to be suffering from leukemia so aggressive that only a bone-marrow transplant can save her. The problem is finding a compatible donor. If, by reproductive happenstance, the girl had been born an identical twin, her matching sister could have produced all...
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