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Deoxyribonucleic acid (DNA) is a molecule that carries the genetic instructions used in the development, functioning, and reproduction of all living organisms. Each DNA molecule is made of chemicals called nucleotides. These DNA building blocks include one of four nitrogen bases: adenine, thymine, guanine, and cytosine, along with sugars and phosphates. The sequence of the nucleotides establishes the genetic instructions that are contained in each strand of DNA.

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Nicotine and Genetics: The Hereditary Predisposition