character: Erwin Chargaff
topic: Chargaff's Rules in DNA
grade: 9
subject: Biology
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character: Avery, MacLeod, and McCarty
topic: DNA as the Genetic Material
grade: 9
subject: Biology
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character: James Watson and Francis Crick
topic: Structure of DNA
grade: 9
subject: Biology
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character: Rosalind Franklin
topic: X-ray Diffraction and DNA Structure
grade: 9
subject: Biology
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