Germans Manufacture Artificial Blood Vessels With a 3-D Printer | Popular Science: "From intestines to tracheas, tissue engineers are building a handful of new body parts — but progress on larger organs has been slow. This is mainly because tissues need nutrients to stay alive, and they need blood vessels to deliver those nutrients. It’s difficult to build those vascular networks, but now a team from Germany may have a solution: Print some capillaries with a 3-D printer."
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