China and US put aside their differences to create the first human monkey hybrid

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For the first time, scientists have created embryos that are a mix of human and monkey cells.

The embryos, described Thursday in the journal Cell, were created in part to try to find new ways to produce organs for people who need transplants, said the international team of scientists who collaborated in the work. But the research raises a variety of concerns.

"My first question is: Why?" said Kirstin Matthews, a fellow for science and technology at Rice University's Baker Institute. "I think the public is going to be concerned, and I am as well, that we're just kind of pushing forward with science without having a proper conversation about what we should or should not do."

Still, the scientists who conducted the research, and some other bioethicists defended the experiment.

"This is one of the major problems in medicine — organ transplantation," said Juan Carlos Izpisua Belmonte, a professor in the Gene Expression Laboratory of the Salk Institute for Biological Sciences in La Jolla, Calif., and a co-author of the Cell study. "The demand for that is much higher than the supply."

"I don't see this type of research being ethically problematic," said Insoo Hyun, a bioethicist at Case Western Reserve University and Harvard University. "It's aimed at lofty humanitarian goals."

Thousands of people die every year in the United States waiting for an organ transplant, Hyun noted. So, in recent years, some researchers in the U.S. and beyond have been injecting human stem cells into sheep and pig embryos to see if they might eventually grow human organs in such animals for transplantation.

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