character: Marshall Nirenberg
topic: Genetic Code
grade: 9
subject: Biology
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character: Francis Crick
topic: Discovery of DNA Structure
grade: 9
subject: Biology
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character: James Watson
topic: Co-discoverer of DNA Structure
grade: 9
subject: Biology
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character: Gregory Pincus
topic: Biology of Reproduction and Genetic Engineering
grade: 9
subject: Biology
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