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Cytokeratins are a subfamily of intermediate filament proteins and are characterized by a remarkable biochemical diversity, represented in human epithelial tissues by at least 20 different polypeptides. They range in molecular weight between 40 kDa and 68 kDa and isoelectric pH between 4.9 - 7.8. The individual human cytokeratins are numbered 1 to 20. The various epithelia in the human body usually express cytokeratins which are not only characteristic of the type of epithelium, but also related to the degree of maturation or differentiation within an epithelium.
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Protein Aliases: CK-9; cytokeratin 9; Cytokeratin-9; K9; keratin 9 (epidermolytic palmoplantar keratoderma); keratin 9, type I; keratin complex 1, acidic, gene 9; Keratin, type I cytoskeletal 9; Keratin-9; krt9; Spermatid perinuclear ring manchette protein K9; type I cytoskeletal 9
Gene Aliases: CK-9; EPPK; K9; Krt1-9; KRT9
UniProt ID: (Human) P35527, (Rat) Q8CIS9, (Mouse) Q6RHW0
Entrez Gene ID: (Human) 3857, (Rat) 266717, (Mouse) 107656
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