in the non alpha-helical tail region the human and the non-mammalian ( xenopus ) keratins are more similar to each other than to the murine protein , indicating that the former are equivalent cytokeratin polypeptides and belonging to a special subclass of type i keratin polypeptides devoid of glycine-rich regions in the carboxy-terminal portion .
C0010803
cytokeratin
C1179970
type i keratin