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Keratins are a large family of proteins that form the intermediate filament cytoskeleton of epithelial cells, which are classified into two major sequence types. Type I keratins are a group of acidic intermediate filament proteins, including K9–K23, and the hair keratins Ha1–Ha8. Type II keratins are the basic or neutral courterparts to the acidic type I keratins, including K1–K8, and the hair keratins, Hb1–Hb6. Keratin 6 is a type II keratin. It is used as marker for epidermal hyperproliferation and differentiation. Three are three keratin 6 isoforms: ketatin 6A, 6B and 6C. They share more than 99% identical DNA sequence.