ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
DNA molecule. Computer artwork of a molecule of DNA (deoxyribonucleic acid) with the chemical formulas of its components. DNA is composed of two sugar-phosphate backbones (blue) and nucleotide bases (red, yellow, green and purple). 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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