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  1. DNA - Wikipedia

  2. DNA Structure - Biology Dictionary

  3. DNA | Definition, Discovery, Function, Bases, Facts, & Structure ...

  4. 9.1: The Structure of DNA - Biology LibreTexts

  5. The Chemical Structure of DNA - BioInteractive

  6. Deoxyribonucleic Acid (DNA) Fact Sheet - National Human …

  7. Heredity - DNA Structure, Composition, Genetics | Britannica

  8. DNA Structure and Shape - Ask A Biologist

  9. DNA and Chromosomes - Molecular Biology of the Cell - NCBI …