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Artwork representing the double helix of the DNA
Abstract representation of deoxyribonucleic acid (DNA). This is the structure which contains the inherited coded instructions responsible for the development of an organism. A DNA molecule is composed of two interwound strands twisted into a helical shape which gives it great stability. Each strand alternates a sugar group with a phosphate group. The two strands are linked by pairs of substances called bases, of which there are four types known as adenine, guanine, thymine and cytosine. The sequence of bases along a strand provides the code for the activities of a cell.
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