The protein encoded by this gene is a member of the keratin gene family. As a type I hair keratin, it is an acidic protein which heterodimerizes with type II keratins to form hair and nails. The type I hair keratins are clustered in a region of chromosome 17q12-q21 and have the same direction of transcription.
^Heid HW, Werner E, Franke WW (Feb 1987). "The complement of native alpha-keratin polypeptides of hair-forming cells: a subset of eight polypeptides that differ from epithelial cytokeratins". Differentiation. 32 (2): 101–19. PMID2431943. doi:10.1111/j.1432-0436.1986.tb00562.x.
^Rogers MA, Winter H, Wolf C, Heck M, Schweizer J (Nov 1998). "Characterization of a 190-kilobase pair domain of human type I hair keratin genes". J Biol Chem. 273 (41): 26683–91. PMID9756910. doi:10.1074/jbc.273.41.26683.
Raica M, Zylis D, Cîmpean AM (2007). "Cytokeratin 20, 34betaE12 and overexpression of HER-2/neu in urine cytology as predictors of recurrences in superficial urothelial carcinoma.". Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie. 46 (1): 11–5. PMID16286979.
Langbein L, Rogers MA, Winter H, et al. (1999). "The catalog of human hair keratins. I. Expression of the nine type I members in the hair follicle.". J. Biol. Chem. 274 (28): 19874–84. PMID10391933. doi:10.1074/jbc.274.28.19874.