CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
DNA in bubble. Conceptual computer artwork of a DNA double helix within a bubble in water. This image could represent the fragility of the DNA molecule or the need for protection of an individual's genetic code from exploitation. A molecule of DNA (deoxyribonucleic acid) consists of two helical strands coiled around the same axis, each strand consisting of alternate phosphate and sugar groups. The strands are held together in a double helix by the hydrogen bonds formed between nucleotide bases attached to the two strands. There are four bases; adenine (A), cytosine (C), guanine (G) and thymine (T). The sequence of the bases forms the genetic code.
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