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by three short linker segments predicted to be in beta-turn conformation. This model has been confirmed by the determination of the crystal structure of a helical domain of keratins.

Type I and II keratins

The human genome has 54 functional annotated keratin genes, of which 28 are type I keratins and 26 are type II keratins.

Fibrous keratin molecules supercoil to form a very stable, left-handed superhelical

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