A new bioprinting project, backed by $24 million from the U.S. Department of Defense, will attempt to 3D-print miniature human organs. The 2-inch "body on a chip" will test how the human body reacts to diseases, chemical warfare agents, and new drugs intended to defend against biological or chemical attacks. Such technology could speed up drug development by replacing animal testing or the simpler testing done on human cells in petri dishes.

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