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Epithelium
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Cells covering external and internal surfaces of the body
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Epidermis
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Thin outer layer of the skin
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Squamous cell layer
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Flat, scale-like epithelial cells comprising the outermost epidermis
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Basal layer
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Deepest layer of epidermis
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Melanocyte
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Cell in the basal layer that gives color to the skin
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Melanin
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Dark brown to black pigment contained in melanocytes
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Dermis
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Dense, fibrous connective tissue layer of the skin, also known as corium
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Sebaceous glands
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Oil glands in the skin
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Sebum
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Oily substance secreted by the sebaceous glands
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Sudoriferous glands
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Sweat glands (sudor = sweat; ferre = to bear)
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Subcutaneous layer
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Connective and adipose issue layer just under the dermis
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Collagen
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Protein substance in skin and connective tissue (koila = glue; gen = producing)
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Hair
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Outgrowth of the skin composed of keratin
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Nail
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Outgrowth of the skin, composed of keratin, at the end of each finger and toe
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Keratin
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Hard protein material found in the epidermis, hair, and nails
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