'Hard' and 'soft' principles defining the structure, function and regulation of keratin intermediate filaments.

By P. Coulombe, M. Omary. Current Opinion in Cell Biology, 2002

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Structure and functions of keratin proteins in simple, stratified, keratinized and cornified epithelia (2009, background): “Keratins and keratin filaments interact with cell-adhesive complexes, i.e. desmosomes, hemidesmosomes and focal adhesions (Maniotis et al. 1997; Coulombe & Omary, 2002).”
Intravital imaging of cell movement in tumours (2003, background): “These keratins form the largest subfamily of intermediate-filament proteins and are important for the mechanical stability of epithelial cells that are subjected to shear force”
Keratin: Structure, mechanical properties, occurrence in biological organisms, and efforts at bioinspiration (2016, neutral): “Keratin represents the most abundant structural proteins in epithelial cells [11], and together with collagen, is the most important biopolymer in animals [12].”
A Functional Enhancer of Keratin14 Is a Direct Transcriptional Target of ΔNp63 (2007, background): “Keratins from these two classes form obligate heterodimers and are expressed in tissue- and differentiation-specific manners in epithelial tissues of various types including simple epithelia, internal stratified epithelia, outer stratified epithelia, and hair follicles (Coulombe and Omary, 2002).”