"Boffins plan to grow rat-human and mouse-human embryos in Japan.
The Japanese Research group has received approval from the government to insert human cells into animal embryos.
After being inserted into the animals, the cells may then grow into organs.
If research goes well, experts plan on introducing the embryos into other animals such as pigs.
He added: “Anytime you take a species and mix it with another, the host species generally does better.
“If you take a rat cell and put it into a mouse blastocyst, the rat cells are at a disadvantage. That’s why in general, chimerism is very low.”
Once the hybrid embryos develop, they will be monitored for one to two years."
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