PITTSBURGH (KDKA) — Like something from a science fiction novel, there are reports that scientists in the United States are working to do something pretty odd.

According to BBC, a team from the University of California is working to overcome the worldwide shortage of transplant organs by growing human organs inside pigs.

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How, you ask?

They have injected human stem cells into pig embryos to produce human-pig embryos known as chimeras. (If you are interested in the specific process utilized to make this happen, there is a full explanation with visual aides on the BBC’s website.)

The researchers believe that the hybrid embryos could develop into normal pigs that house human organs.

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For now, scientists have only allowed embryos to develop 28 days inside female pigs before terminating the pregnancy and studying the tissue.

There is a strange concern that has come along with the study.

“We think there is very low potential for a human brain to grow, but this is something we will be investigating,” said Pablo Ross, a reproductive biologist who is leading the research.

As one may expect, animal rights advocates have not been thrilled at the idea.

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Peter Stevenson of the British organization Compassion in World Farming expressed concern to the BBC that pigs bred for human medical uses would be “a new source of animal suffering.”