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1 (of 9) William G. Kaelin Jr receiving his Nobel Prize from H.M. King Carl XVI Gustaf of Sweden at Konserthuset Stockholm on 10 December 2019.

© Nobel Media. Photo: Nanaka Adachi

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2 (of 9) William G. Kaelin Jr after receiving his Nobel Prize from H.M. King Carl XVI Gustaf of Sweden at Konserthuset Stockholm on 10 December 2019.

© Nobel Media AB. Photo: N. Adachi

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3 (of 9) William G. Kaelin Jr and Sweden's Princess Madeleine at the table of honour at the Nobel Banquet, 10 December 2019.

© Nobel Media AB. Photo: A. Mahmoud

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4 (of 9) Twelve of the fifteen Nobel Laureates of 2019 assembled at the Nobel Foundation in Stockholm on 12 December 2019. Back row: James Peebles, Abhijit Banerjee, Didier Queloz, Michael Kremer, William G. Kaelin Jr and Sir Peter J. Ratcliffe. Front row: Olga Tokarczuk, Akira Yoshino, Esther Duflo, M. Stanley Whittingham, Gregg L. Semenza and Michel Mayor.

© Nobel Media. Photo: A. Mahmoud

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5 (of 9) William G. Kaelin delivering his Nobel Lecture on 7 December 2019 at Aula Medica, Karolinska Institutet in Stockholm.

© Nobel Media AB. Photo: Alexander Mahmoud

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6 (of 9) William G. Kaelin Jr in his home in Boston shortly after receiving the call from Sweden about being awarded the Nobel Prize, 7 October 2019.

Photo: Stephanie Mitchell/Harvard University

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7 (of 9) William G. Kaelin Jr in his home in Boston shortly after receiving the call from Sweden, 7 October 2019.

Photo: Stephanie Mitchell/Harvard University

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8 (of 9) William G. Kaelin Jr in the laboratory, 2009.

Photo: Sam Ogden, Dana-Farber Cancer Institute

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9 (of 9) Researcher William G. Kaelin Jr. is currently professor in the Department of Medicine at Dana-Farber and at Brigham and Women’s Hospital, Harvard Medical School and is a Howard Hughes Medical Institute Investigator.

Photo: Sam Ogden, Dana-Farber Cancer Institute