ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
DNA lettering. Artwork showing the word "DNA" in digital lettering over a sequence of nucleotide bases that makes up the code of DNA (deoxyribonucleic acid). It is this sequence of four bases that determines the genetic instructions necessary to build a living organism. Here each base is represented by a letter: adenine (a), thymine (t), cytosine (c) and guanine (g). A gene sequence of these bases may characterise one of the many genetic traits in humans such as hair or eye colour.
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