Shimon Sakaguchi

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2026-06-23

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Who is this?

Shimon Sakaguchi (坂口志文, Sakaguchi Shimon; born 19 January 1951) is a Japanese immunologist, a Distinguished Professor of Osaka University, and a Professor Emeritus of Kyoto University. His work includes the discovery of regulatory T cells and describing their role in the immune system. In 2025, he was jointly awarded the Nobel Prize in Physiology or Medicine with Mary E. Brunkow and Fred Ramsdell.