Scientists in the United States are trying to grow human organs inside pigs by injecting human stem cells into pig embryos to produce human-pig embryos known as chimeras. That's right, human-pig embryos. The team from University of California, Davis says they should look and behave like normal pigs except that one organ will be composed of human cells. The embryos are being allowed to develop in the sows for 28 days before the pregnancies are terminated and the tissue removed for analysis. The Japanese are growing them to 82 days. The fear is that some stem cells may migrate to the pig brain. I know plenty of human pigs, even have a pig dog, but 'pig humans' wow, sounds like ScFi and scares the hell out of me.
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