A whole organ has been grown inside an animal for the first time

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Scientists have grown an important immune system organ from scratch inside a mouse, a breakthrough that could lead to alternatives to organ transplants in humans.

Researchers from the University of Edinburgh in Scotland have taken a group of cells from a mouse embryo and grown them into a fully functional thymus, an immune system organ, in an adult mouse.

This is the first time a whole organ has been grown from scratch inside an animal, and the findings, which have been published in Nature Cell Biology, could pave the way for alternatives to organ transplants.

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