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In this Dec. 17, 2018 photo, John Szivek, Rubin chair in orthopedic research professor at the University of Arizona, explains how the scaffold made from a 3-D printer is tested in Tucson, Ariz. Szivek received a $2 million grant from the U.S. Department of Defense to develop technology that could help military personnel recover from bone-shattering injuries using a 3-D printer and adult stem cells. (Mamta Popat /Arizona Daily Star via AP)

In this Dec. 17, 2018 photo, John Szivek, Rubin chair in orthopedic research professor at the University of Arizona, explains how the scaffold made from a 3-D printer is tested in Tucson, Ariz. Szivek received a $2 million grant from the U.S. Department of Defense to develop technology that could help military personnel recover from bone-shattering injuries using a 3-D printer and adult stem cells. (Mamta Popat /Arizona Daily Star via AP)

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