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Five distinct layers of mammalian epidermis.

Stratum corneum

Outermost. Comprised of deceased skin cells.
Keeps the skin hydrated while preventing water loss by evaporation.

Stratum lucidum

Second layer.

Stratum granulosum

Third layer.

Stratum spinosum

Fourth layer.

Stratum basale

Innermost layer. Layer in which skin cells are created.
Melanocytes are present in this layer in endothermic animals. In humans, nails grow from this layer.

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