title: The topoisomerase activity of T4 amG39 mutant is restored in Mu lysogens.
mesh_terms: D004264:DNA Topoisomerases, Type I / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology*; D005838:Genotype; D007700:Kinetics; D008242:Lysogeny; D009154:Mutation; D013604:T-Phages / Q000201:enzymology*
chemical_list: D004264:DNA Topoisomerases, Type I