Dr. Francis Collins, director of the National Institutes of Health, appears before a Senate Health, Education, Labor and Pensions Committee hearing to discuss vaccines and protecting public health during the coronavirus pandemic on Capitol Hill, on Wednesday, Sept. 9, 2020, in Washington. Collins says he is stepping down by the end of the year, having led the research center for 12 years and becoming a prominent source of public information during the coronavirus pandemic. A formal announcement was expected Tuesday, Oct. 5, 2021, from NIH. (Michael Reynolds/Pool via AP, File)
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