Scientists have successfully created embryos that are made of both human and monkey cells in the search for transplant organs.

“This is one of the major problems in medicine — organ transplantation,” Juan Carlos Izpisua Belmonte, a professor in the Gene Expression Laboratory of the Salk Institute for Biological Sciences and a co-author of the study shared in the journal Cell. The findings were reported by NPR in a piece published Thursday. (RELATED: UK Scientists Create ‘Designer Embryos’ With Three People’s DNA)

“The demand for that is much higher than the supply,” he added.

For the first time, U.S. and Chinese scientists have created embryos that are part human, part monkey, in an effort to find new ways to produce organs for transplants.

But some ethicists worry about how such research could go wrong.https://t.co/X0yyxnLRnP

— NPR (@NPR) April 15, 2021

The team of scientist injected 25 cells known as induced pluripotent stem cells from humans into macaque monkey embryos, the outlet noted. After just one day, researchers reported being able to detect human cells growing in 132 of the embryos and could study them for up to 19 days. (RELATED: Chris Brown Reportedly Facing Criminal Charges Over His Pet Monkey)

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

But the research is raising a whole host of questions as to whether this should be done.

“My first question is: Why?” Kirstin Matthews, a fellow for science and technology at Rice University’s Baker Institute said. “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.”

“Should it be regulated as human because it has a significant proportion of human cells in it?” she added. “Or should it be regulated just as an animal? Or something else? At what point are you taking something and using it for organs when it actually is starting to

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