BIOSYM TECHNOLOGIES, INC. / SCIENCE PHOTO LIBRARY BIOSYM TECHNOLOGIES, INC. / SCIENCE PHOTO LIBRARY
Kallikrein. Molecular graphic showing different models of the protein kallikrein. The structure on the right shows 10 individual models of the protein, each in a different colour. The thickness of the ribbon on the left represents the extent of deviation of these 10 structures from the average. Proteins are made from long chains of simple units called amino acids. Only 20 amino acids are found in proteins, but thousands of different proteins exist in nature. Genes directly determine the order of amino acids along a protein. This order determines the shape of the protein, which in turn defines the molecule's chemistry.
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