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How to Grow Human Organs in a Pig

Infographic shows new research developments and future hopes for human/animal chimeras

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American


Earlier today, reports emerged that researchers at the Salk Institute had, for the first time, successfully created human/pig chimera embryos. Juan Carlos Izpisúa Belmonte, the scientist leading the effort, wrote an article for the November 2016 issue of Scientific American describing his dream of using chimeric animals to grow human organs for patients needing transplants. 

While the idea of a human/pig chimera may conjure ghastly images of freakish-looking hog-people, the reality is much less disturbing. In fact, one of the most notable successes of the experiment, according to Belmonte, was that the contribution of the human cells to the developing pig embryo was very small. The fear, from an ethical standpoint, had been that the human cells would over-contribute, straying from the target site to the developing brain, for example. This did not happen, and the human cells survived the full four months during which the embryos were allowed to develop.

The researchers encountered many challenges throughout the study, making clear that despite the relative success of this experiment, creating a whole, mature human organ in an animal remains a distant prospect. Nonetheless, the work continues. The graphic below breaks down how researchers hope the process will one day work.


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Credit: Amanda Montañez

Amanda Montañez has been a graphics editor at Scientific American since 2015. She produces and art directs information graphics for the Scientific American website and print magazine. Amanda has a bachelor's degree in studio art from Smith College and a master's in biomedical communications from the University of Toronto. Before starting in journalism, she worked as a freelance medical illustrator.

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