Scientists in the US have used a 3D printer to create living body parts.
The printed body parts have been implanted into animals, where they functioned normally.
The printers use a plastic-like material and a gel containing living cells to create complex structures, like this section of jawbone.
The researchers hope that in future, the technique could be used to create 3D-printed parts that could be implanted into humans.
So far, it has only been tested in mice.
Tom Chivers is a science writer for BuzzFeed and is based in London.
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