DNA helix. Computer artwork of the double helix of DNA (deoxyribonucleic acid), formed by spiralling paired strands of sugar phosphates that are linked by nucleotide base pairs. These pairs form struts, as on a ladder. The arrangement of the four types of nucleotide base (adenine, thymine, guanine and cytosine) along a helix of DNA forms the genetic code for protein synthesis and the functioning and growth of every living organism. DNA is found in cell nuclei.

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