https://medlineplus.gov/genetics/understanding/basics/
Cells and DNA: MedlinePlus Genetics
Discover the basics of cells, DNA, genes, chromosomes and how they work.
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https://medlineplus.gov/genetics/understanding/basics/dna/
What is DNA?: MedlinePlus Genetics
DNA is the hereditary material in humans and almost all other organisms. Genes are made up of DNA.
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