Human bone may be the next promising product to emerge from 3D printers. Kevin Shakeshaff, a professor of pharmacy at the University of Nottingham in England, is working on technology that uses a 3D printer to create scaffolding coated with adult human stem cells in the precise bone shape needed. Bone-like strength is supplied by the printer's "ink," a combination of polylactic acid and alginate, which is gradually replaced by the patient's own bone cells after implantation.

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