title: DNA topoisomerases: why so many?
authors.affiliation: Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts 02138.
authors.forename: J C
authors.initials: JC
authors.lastname: Wang
mesh_terms: D002875:Chromosomes / Q000502:physiology; D004261:DNA Replication; D004264:DNA Topoisomerases, Type I / Q000378:metabolism*; D004250:DNA Topoisomerases, Type II / Q000378:metabolism*
chemical_list: D004264:DNA Topoisomerases, Type I; D004250:DNA Topoisomerases, Type II