FeathersKeratinsHardnessKeratins, Type IIPsittaciformesKeratins, Hair-SpecificTensile StrengthMaterials TestingZirconiumKeratins, Type IKeratin-8Intermediate FilamentsDental Porcelainbeta-KeratinsPliabilityDental Stress AnalysisYttriumKeratin-14Biomechanical PhenomenaDifferential Thermal AnalysisCompressive StrengthKeratin-10BirdsHoof and ClawSilkMechanical PhenomenaSpidersEpidermisEpidermolysis Bullosa SimplexStress, MechanicalGlassBeakHyperkeratosis, EpidermolyticKeratin-1ParrotsMicroscopy, Electron, ScanningElastic ModulusX-Ray MicrotomographyAluminum OxideMoltingHardness TestsPolymethyl MethacrylateIntegumentary SystemBird DiseasesKeratin-5ElasticityMagnesium OxidePigmentationSilanesSkinKeratin-18Mechanical ProcessesPorositySurface PropertiesNew CaledoniaDental MaterialsKeratin-17HairPasseriformesKeratinocytesPolymerizationCeramicsDesiccationAcrylic ResinsComposite ResinsTooth FracturesBone and BonesDinosaursDiamondColorMechanicsFossilsChick EmbryoKeratin-16PowdersFlight, AnimalAluminum SilicatesDental VeneersIntermediate Filament ProteinsEpitheliumDenture BasesKeratoderma, PalmoplantarFractures, BonePhthirapteraResins, SyntheticFemoral FracturesChickensKeratin-2