ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Human genome. Computer illustration representing the human genome, showing a historical drawing of a man by Leonardo da Vinci, seen with a DNA (deoxyribonucleic acid) genetic sequence (blue). DNA, the genetic material found in all living cells, encodes and controls the hereditary characteristics of living organisms. The complete genetic code of each person, their genome, is written as a unique sequence of four nucleotide bases. At left the code is seen with letters representing the bases: adenine (A), thymine (T), cytosine (C) and guanine (G).
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