DNA, computer artwork. DNA (deoxyribonucleic acid) consists of two strands (blue) of sugar phosphates forming a double helix (spiral). The strands are held together by interactions between nucleotide bases (thin struts) on each strand. There are four types of nucleotide base: adenine, thymine, cytosine and guanine. The base sequence along the molecule is the inherited genetic code that controls growth and development. DNA, found in all living things, is stored in cell nuclei.
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