SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
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Illustration of Alexander Fleming (August 6, 1881 - March 11,1955), the Scottish biologist most famous for discovering penicillin in 1928. He is depicted here with a petri dish containing Penicillium notatum (the mold from which the antibiotic penicillin originally derived), as well as penicillin's chemical compound structure.
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