xDNA molecule

xDNA molecule

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: xDNA molecule. 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. xDNA, which was created by 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. xDNA is also naturally fluorescent, emitting a violet light. DNA contains sections called genes, which encode the body's genetic information.

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