ANNA WRIGHT / SCIENCE PHOTO LIBRARY ANNA WRIGHT / SCIENCE PHOTO LIBRARY
DNA helices. Artwork of several double helices 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 along a helix of DNA forms the genetic code for protein synthesis and the functioning and growth of all living organisms. DNA is found in cell nuclei.
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