In addition to manufacturing of everyday goods like shoes and tools, new research is applying 3D printing to biology. Scientists are currently testing techniques that will make possible the printing of human body tissues and, ultimately, whole organs.[273] The general principle involves a biologically inactive material, such as synthetic polymer or ceramic, printed into a three-dimensional “scaffold” in the shape of the desired body structure. Fluid rich with reprogrammed stem cells is then deposited over the scaffold, where the cells multiply and fill in the appropriate shape, thereby
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