ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
DNA molecule. Computer artwork of a molecule of deoxyribonucleic acid (DNA) with rings around it. DNA is composed of two strands twisted into a double helix. Each strand consists of an outer sugar-phosphate backbone (thick red line) with nucleotide bases attached (red lines inside helix). There are four different bases: guanine, cytosine, thymine and adenine. DNA contains sections, called genes, which encode the body's genetic information. This image could represent the processing of DNA.
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