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Leather
Skin
Skin is a complex structure made up of:
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hair;
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sweat glands;
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fat;
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blood vessels; and
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a layer of collagen fibre bundles containing protein. In the corium, or the body of the skin, these fibres are large and losely-woven. In the protective grain layer, these fibres are finely and tightly-packed.
The grain layer or hair side is the outside surface layer of the skin. The underside of the skin is known as the flesh side.
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