DNA, CircularHepadnaviridae InfectionsHepatitis B Virus, DuckDucksExtrachromosomal InheritanceHepatitis, Viral, AnimalDNA, ViralDNA, SuperhelicalHepatitis B virusHepadnaviridaeTupaiaMarmotaPlasmidsArabinofuranosyluracilHepatitis B Virus, WoodchuckEthidiumDNA, BacterialNucleic Acid ConformationVirus ReplicationCircular DichroismNucleic Acid RenaturationDNA Restriction EnzymesAntiviral AgentsDNA ReplicationHepatitis BHepatocytesCentrifugation, Density GradientLamivudineGenome, ViralNucleic Acid DenaturationBase SequenceElectrophoresis, Agar GelHepatitis B Surface AntigensHepatitis B, ChronicDeoxyribonucleasesDNA, Single-StrandedEscherichia coliEndonucleasesPolynucleotide LigasesLiverR FactorsMicroscopy, ElectronMolecular WeightColiphagesDNARecombination, GeneticDNA Topoisomerases, Type IMolecular Sequence DataConjugation, GeneticKineticsChromosomes, BacterialTransformation, BacterialSimian virus 40TetracyclineCell LineCloning, MolecularNucleic Acid HybridizationTransformation, GeneticTritiumOsmolar ConcentrationDNA, RecombinantMutationPseudomonasDrug Resistance, MicrobialTransfectionChloramphenicolBacteriophagesBacteriophage phi X 174RNA, ViralCell NucleusChromosome MappingGenesDNA LigasesTranscription, GeneticTemplates, GeneticTemperatureRepetitive Sequences, Nucleic Acid