. . "DNA topoisomerase" . "Topoisomerase" . . "dna topoisomerase iv" . "topoisomerase II" . "toposomerase" . "Topoisomerase" . . "topoisomerases I and II" . . . . . . "type I topoisomerase" . "topoisomerase" . "Topoisomerase I" . . . . "5.6.2.1" . . . "5.6.2.2" . . . .