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Research and Development Engineer Avinash Eranki examines a donated placenta as researchers are working to create a 3D bioprinted version to study preeclampsia at Children's National Medical Center, in Washington, Wednesday, June 15, 2016. Researchers are looking into how problems with the placenta lead to health threats from preeclampsia to Zika. (AP Photo/Andrew Harnik)

Research and Development Engineer Avinash Eranki examines a donated placenta as researchers are working to create a 3D bioprinted version to study preeclampsia at Children's National Medical Center, in Washington, Wednesday, June 15, 2016. Researchers are looking into how problems with the placenta lead to health threats from preeclampsia to Zika. (AP Photo/Andrew Harnik)

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