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Chitin is a polysaccharid that forms a major component of the exoskeleton of different groups of arthropods, like insects, crustaceans and spiders. Chitin closely resembles cellulose, a component of cell walls in plants. Fungi have chitin cell walls. Trilobites form an important group of arthropods of which the exoskeleton does not consist of chitin, but of Calcite instead.
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