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"Our lack of knowledge is grossly apparent, Wolf said. We really don't have much of a clue" about why cloning so often goes wrong, he said.

Fortunately, we do have some guesses. Cloning requires taking a nucleus from an adult cell that is developed for a particular function in a particular part of the body. To properly specialize, nuclei of adult cells turn off certain genes, or certain copies of genes, and turn on others.

But transferring that nucleus out of that cell and into an egg doesn't necessarily guarantee that it will forget its past and revert to the uncommited state of an embry…