ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
DNA. Computer artwork of a DNA (deoxyribonucleic acid) double helix (vertical) seen against auto- radiograms of genetic sequences (lower left). The spiralling strands of the DNA helix (blue) are composed of complex chemical groups called nucleo- tides, which consist of a sugar phosphate and a base group. Complementary pairing between the base groups of nucleotides on opposite strands holds the helix together. The sequence of the 4 base groups (adenine, cytosine, guanine and thymine, coloured rods) along the DNA helix is unique for every individual and is known as the genetic code. The autoradiograms depict DNA base sequences, each band (black) representing an individual base.
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