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In this Tuesday, April 25, 2017 photo, post doctoral fellow Leslie Mitchell, works at her bench at a New York University lab in the Alexandria Center for Life Sciences in New York, where researchers are attempting to create completely man-made, custom-built DNA. Mitchell says it took her a couple months to build her chromosome but longer to debug. "The tiniest change in the code can have dramatic effect on growth,” she said. “We are learning new rules about how cells operate by building from scratch." (AP Photo/Mary Altaffer)

In this Tuesday, April 25, 2017 photo, post doctoral fellow Leslie Mitchell, works at her bench at a New York University lab in the Alexandria Center for Life Sciences in New York, where researchers are attempting to create completely man-made, custom-built DNA. Mitchell says it took her a couple months to build her chromosome but longer to debug. "The tiniest change in the code can have dramatic effect on growth,” she said. “We are learning new rules about how cells operate by building from scratch." (AP Photo/Mary Altaffer)

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