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Tissue engineers have tried for years to produce lab-grown vascularized human cells robust enough to provide as replacements for broken human being cells. Others have printed individual tissue before, however they have already been limited by thin slices of cells about a third as solid as a dime. When scientists try to print thicker layers of cells, cells on the inside starve for oxygen and nutrition, and have no good way of removing carbon dioxide and other waste. So they suffocate and die. Nature gets around this problem by permeating cells with a network of small, thin-walled arteries that nourish the tissue and remove waste, so Kolesky and Lewis set out to mimic this essential function.

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