As soon as they know how to make liver cells from embryonic stem cells, it can start selling them to drug companies.

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Laboratory tests have shown the treatment can improve the function of the liver by repopulating it with stem cells.

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"We already have 3D printers that can be injected with stem cells, printing micro slices of liver, " Mr Olguin added.

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Researchers hope to turn stem cells into specific cells, such as heart or liver or nerve cells.

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Surprisingly, the neural stem cells made their way far and wide in the developing embryos, from the nervous system to the liver, lung and intestine.

ECONOMIST: Stem cells