Chitin

General information
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Next to cellulose the most common polysaccharide on earth.
Structural differentiation of cellulose by an acetamide group.
Largest distribution in the animal kingdom as a component in the exoskeleton of many arthropods.
In the fungal kingdom, chitin is partly found in a number of lower fungi and as a cell wall component in basidiomycetes, ascomycetes and phycomycetes.
Chitosan is derived from chitin.