miscellaneous:There are two types of cytoskeletal and microfibrillar keratin: I (acidic; 40-55 kDa) and II (neutral to basic; 56-70 kDa) . ,similarity:Belongs to the intermediate filament family. ,subunit:Heterotetramer of two type I and two type II keratins. ,tissue specificity:Expressed in a discontinuous manner in the basal cell layer of adult skin epidermis , but continuously in the basal layer of fetal skin epidermis and nail. Also expressed in the outer root sheath above the hair bulb in hair follicle (at protein level) . Expressed homogeneously in all cell layers of the esophagus and exocervix , but detected in the basal cell layer only of oral mucosa , skin and in the basal plus the next two layers of the suprabasal epithelium of the palate. ,
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