AlkaloidsTopoisomerase II InhibitorsTopoisomerase I InhibitorsDNA Topoisomerases, Type IDNA Topoisomerases, Type IIErgot AlkaloidsTopoisomerase InhibitorsIndole AlkaloidsPyrrolizidine AlkaloidsVinca AlkaloidsDNA Topoisomerase IVAmsacrineCinchona AlkaloidsTeniposideCamptothecinBerberine AlkaloidsDNA, SuperhelicalAmaryllidaceae AlkaloidsEtoposideAconitumDNA TopoisomerasesEllipticinesDNADNA CleavageDNA, CatenatedRazoxaneNovobiocinIntercalating AgentsAntigens, NeoplasmAporphinesAntineoplastic Agents, PhytogenicClavicepsDNA DamageCatharanthusBenzylisoquinolinesDelphiniumDNA-Binding ProteinsDNA GyraseMolecular StructureBerberinePodophyllotoxinEnzyme InhibitorsTopotecanAntineoplastic AgentsMolecular Sequence DataSolanaceous AlkaloidsPlant ExtractsBase SequenceNeotyphodiumCoptisDrug Screening Assays, AntitumorRutaceaePlant PoisoningDrug ResistanceCatalysisNucleic Acid ConformationDNA, KinetoplastAminoacridinesErgotismQuinolonesLycopodiumErgotamineIsoquinolinesTumor Cells, CulturedAnti-Infective AgentsLeukemia P388ThiobarbituratesSubstrate SpecificityLysergic AcidStereoisomerismPapaverRubiaceaePlasmidsDiterpenesMutationEphedraEscherichia coliHeterocyclic Compounds with 4 or More RingsFluoroquinolonesAminocoumarinsBelladonna AlkaloidsHarmineIsoenzymesDoxorubicinKineticsAspidospermaDNA ReplicationAmino Acid SequencePapaveraceaeCell CycleIndenesBinding SitesSaccharomyces cerevisiaePoriferaPlants, MedicinalPlant BarkDrug Resistance, NeoplasmCrithidia fasciculataAclarubicinCell Line, Tumor