AlkylationDNA DamageDNA RepairAlkylating AgentsMethyl MethanesulfonateMethylnitronitrosoguanidineO(6)-Methylguanine-DNA MethyltransferaseMonomethylhydrazineDNA GlycosylasesDNA Repair EnzymesN-Glycosyl HydrolasesDNAMethyltransferasesAcronineLeucomycinsMethylnitrosoureaMutagensGuanineEndodeoxyribonucleasesMutationEscherichia coliDistamycinsAntineoplastic Agents, AlkylatingNylonsDNA AdductsEscherichia coli ProteinsNitrosaminesDimethylnitrosamineIndoles1,2-DimethylhydrazinePyrroles