Connective Tissue CellsConnective TissueEpithelial CellsFibroblastsConnective Tissue DiseasesConnective Tissue Growth FactorMicroscopy, ElectronCells, CulturedPlatelet-Derived Growth FactorCollagenSkinImmunohistochemistryMixed Connective Tissue DiseaseRNA, MessengerEpitheliumCell LineGranulation TissueImmediate-Early ProteinsIntercellular Signaling Peptides and ProteinsGingivaExtracellular Matrix