Jonathan Zalevsky, (left) chief science officer talks with protien chemists Yinyan Tang and Thomas Chang in the pharmaceutical lab at the headquarters of Nektar Therapeutics on Thursday Feb. 1, 2018, in San Francisco, Calif.
Jonathan Zalevsky, (left) chief science officer talks with protien chemists Yinyan Tang and Thomas Chang in the pharmaceutical lab at the headquarters of Nektar Therapeutics on Thursday Feb. 1, 2018, in San Francisco, Calif. (Photo by Michael Macor/San Francisco Chronicle via Getty Images)

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