Guided Tissue Regeneration, PeriodontalAbsorbable ImplantsMembranes, ArtificialGuided Tissue RegenerationBone RegenerationMembranesCell MembraneMembrane LipidsIntracellular MembranesMembrane PotentialsBlood-Brain BarrierMembrane FluidityErythrocyte MembraneCell Membrane PermeabilityBasement MembraneMembrane Transport ProteinsMembrane GlycoproteinsLipid BilayersPermeabilityMicroscopy, ElectronMitochondrial MembranesProtein TransportCell LineSynaptic MembranesModels, BiologicalLiposomesProtein BindingBlood-Retinal BarrierCells, CulturedCalciumBlood-Air BarrierCell FractionationProtein Structure, TertiaryCarrier ProteinsHydrogen-Ion ConcentrationEscherichia coliMutationMicroscopy, FluorescenceDetergentsExtraembryonic MembranesTight JunctionsElectrophoresis, Polyacrylamide GelPhosphatidylcholinesMolecular Sequence DataEndoplasmic ReticulumBacterial ProteinsTime FactorsGolgi ApparatusFreeze FracturingBlood-Testis BarrierCommunication BarriersRecombinant Fusion ProteinsTemperatureBiological Transport, ActiveMicroscopy, ConfocalMolecular WeightPotassiumModels, MolecularAmino Acid Sequence