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columns of dead keratinocytes held together by proteins with two main regions


first region, portion above the skin, have three circular layers of cells


second region, portion under the skin thru epidermis down to dermis, have three cicular layer of cells


inner, central layer


thickest layer surrounds the medulla, majority of the shaft makes up most of the hair


outter layer, made of a single row of keratinocytes

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