Thick Skin

The epidermis is divided into several layers where cells are formed through mitosis at the innermost layers. They move up the strata, changing shape and composition as they differentiate and become filled with keratin. They eventually reach the top layer, called the stratum corneum, consisting of approximately 15-350 layers of dead cells strengthened and made water-resistant by the keratin. This process is called keratinization. The dead cells are then sloughed off, or desquamated, which takes place within weeks. (from wikipedia)

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