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The outer most layer of the skin is called epidermis.Many of the cells of epidermis produce protein called keratin. The new epidermal cells are formed at the base of the skin and hence the older cells are pushed to surface. The surface cells protect the inner new cells.Gradually the surface cells get filled with keratin. This process is called kertinization.During this process the epidermes gets dividd into five distinct regions.Top most layer is stratum corneum. It consists of more than 20 layers of dead cells. These cells get filled with keratin. These cells are said to be cornified. The cornified cells are surrounded by a hard protective envelope,which makes the skin waterproofing....more over there are other layers of epidermis which has its independent function.

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