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ADVANCE FOR USE SATURDAY, MARCH 11, 2017 AND THEREAFTER- In this Feb. 16, 2017, photo, Briar Cliff University biology professor Daniel Jung gestures to a series of petri dishes in Heelan Hall on the Sioux City, Iowa, college's campus, as student-researchers Avery Sitzman, center and Abby Furlich look on. (Tim Hynds/Sioux City Journal via AP)

ADVANCE FOR USE SATURDAY, MARCH 11, 2017 AND THEREAFTER- In this Feb. 16, 2017, photo, Briar Cliff University biology professor Daniel Jung gestures to a series of petri dishes in Heelan Hall on the Sioux City, Iowa, college's campus, as student-researchers Avery Sitzman, center and Abby Furlich look on. (Tim Hynds/Sioux City Journal via AP)

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