ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
DNA molecule. Computer artwork of a molecule of deoxyribonucleic acid (DNA). DNA is composed of two strands twisted into a double helix. Each strand consists of an outer sugar-phosphate backbone (thick silver line) with nucleotide bases attached (lines inside helix). There are four different bases: guanine (G), cytosine (C), thymine (T) and adenine (A).
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