title: A new twist to the topoisomerase I problem.
authors.affiliation: Whitehead Institute, Cambridge, Massachusetts 02142.
authors.forename: G R
authors.initials: GR
authors.lastname: Fink
mesh_terms: D000818:Animals; D004264:DNA Topoisomerases, Type I / Q000145:classification / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D006801:Humans; D010802:Phylogeny; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics; D013489:Suppression, Genetic
chemical_list: D004264:DNA Topoisomerases, Type I