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In this May 2020 photo provided by Eli Lilly, a researcher tests possible COVID-19 antibodies in a laboratory in Indianapolis. Antibodies are proteins the body makes when an infection occurs; they attach to a virus and help it be eliminated. (David Morrison/Eli Lilly via AP)

In this May 2020 photo provided by Eli Lilly, a researcher tests possible COVID-19 antibodies in a laboratory in Indianapolis. Antibodies are proteins the body makes when an infection occurs; they attach to a virus and help it be eliminated. (David Morrison/Eli Lilly via AP)

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