FibronectinsCarbohydratesGlycopeptidesPeptide FragmentsFibroblastsElectrophoresis, Polyacrylamide GelTrypsinAmino AcidsCell LineMolecular WeightSequence Homology, Amino AcidProtein Interaction Domains and Motifssrc Homology DomainsRecombinant Fusion ProteinsProtein ConformationBinding SitesSequence AlignmentProtein BindingProtein Structure, SecondaryRecombinant ProteinsMutagenesis, Site-DirectedPDZ DomainsCloning, MolecularCrystallography, X-RayAmino Acid MotifsStructure-Activity Relationship