There's something undeniably creepy about an animal that is partly human. And the more human it gets, the creepier it becomes. That is why the news that a Japanese team is well on its way to creating pigs with human organs has been described as something that will "ensure the employment of a generation of bioethicists" (see page 6). That is probably an exaggeration. Bioethicists have already examined the problem of human-animal chimeras in depth. Even so, the new research suggests that they will need to be called back into action very soon.
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