This undated photo provided by the Boyce Thompson Institute shows corn leaf aphids used in a study to modify crop plants through engineered viruses. In an opinion paper published Thursday, Oct. 4, 2018, in the journal Science, the authors say the U.S. needs to provide greater justification for the peace-time purpose of its Insect Allies project to avoid being perceived as hostile to other countries. Other experts expressed ethical and security concerns with the research, which seeks to transmit protective traits to crops already growing in the field. (Meena Haribal/Boyce Thompson Institute via AP)
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