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![Alexander Fleming](https://cdn.britannica.com/91/591-050-AF93D1CF/Alexander-Fleming.jpg?h=400&w=300&c=crop)
Alexander Fleming
Scottish bacteriologist
![Chain](https://cdn.britannica.com/60/13060-050-08368C98/Chain.jpg?h=400&w=300&c=crop)
Sir Ernst Boris Chain
British biochemist
![Lord Florey.](https://cdn.britannica.com/17/11817-050-8A98DED4/Florey.jpg?h=400&w=300&c=crop)
Howard Walter Florey, Baron Florey
Australian pathologist
![Dorothy Hodgkin](https://cdn.britannica.com/74/69074-050-7A62C199/Dorothy-Crowfoot-Hodgkin.jpg?h=400&w=300&c=crop)
Dorothy Hodgkin
English chemist
![R.B. Woodward, 1966.](https://cdn.britannica.com/16/8716-004-14B4E051/RB-Woodward-1966.jpg?h=400&w=300&c=crop)
Robert Burns Woodward
American chemist
![Sir Robert Robinson.](https://cdn.britannica.com/72/69072-050-73E055D1/Robert-Robinson.jpg?h=400&w=300&c=crop)
Sir Robert Robinson
British chemist
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