J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
DNA molecule. Computer artwork of the structure of deoxyribonucleic acid (DNA). DNA is composed of two sugar-phosphate strands twisted into a double helix. Between the strands are nucleotide bases. There are four different bases: guanine, cytosine, thymine and adenine. DNA contains sections called genes, which encode the body's genetic information.
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