CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
DNA jigsaw. Conceptual computer artwork of a DNA (deoxyribonucleic acid) molecule formed by pieces of a jigsaw puzzle. This could represent piecing together information about DNA, either the initial discovery of its structure (1953), or mapping the genome (the DNA code) for particular species (a rough map of the human genome was completed in 2000). DNA is a long, helical molecule, formed of two intertwining strands linked by the nucleotide bases on the strands (vertical struts seen here). The sequence of these nucleotide bases forms the genetic code for the growth and development of living things. DNA is found in cell nuclei.
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