ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Computer artwork of a molecule of expanded deoxyribonucleic acid (xDNA). DNA is composed of two strands twisted into a double helix. Each strand consists of a sugar-phosphate backbone (white) attached to nucleotide bases (blue and pink). There are four different bases: guanine, cytosine, thymine and adenine. Professor Eric Kool and colleagues at Stanford University, USA, has an extra ring added to adenine (xA) and thymine (xT). This makes the molecule wider and more heat resistant. DNA contains sections called genes, which encode the body's genetic information.
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