Noah died two days after his birth from dysentery, an illness allegedly unrelated to the cloning process.

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It is judged to result from epigenetic changes arising during the cloning process.

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The difference lies in the large number of individuals that fall by the wayside at every step of the cloning process.

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In addition to the extremely expensive process of cloning, for each patient you have to culture stem cells and reliably turn them into the tissue you want with 100% efficiency, so you don't get a single left over stem cell that will cause tumors.

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That scandal, as well as ethical concerns about the dangers of encouraging work that could lead to human cloning, dried up interest in getting the process to work with human cells.

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The process looks at least as inefficient as cloning in animals.

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Researchers in South Korea have made the process of creating embryonic stem cells through the cloning of human cells far more efficient than scientists previously believed was possible.

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There is no law against private stem cell research in the US, but Mr Bush has called for an international United Nations ban on all human cloning, prompting ire from a number of countries which allow the process under regulated conditions for research purposes.

BBC: NEWS | Americas | Q&A: The politics of stem cells