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Leather
Collagen
Collagen is probably the most abundant protein in the animal kingdom. It is a major component of skin, tendon, cartilage, and is found in bone and teeth.
Collagen molecules are bonded together to produce fibres. In animal skins there is a structure of fibres held together by crosslinks. This structure accounts for the great strength of collagen and the fact that the fibres are insoluble.
These fibres can be broken down to produce a collagen product that has a very random structuregelatine.
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