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

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When the slices of liver were black she scooped them off the pan and put them on their plates with the eggs.

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Biodegradable plastic is then poured into the mould to make enough slices that can be sandwiched together using pressure and heat, to create a scaffold for a whole liver.

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