title: DNA without supertwists can be an in vitro substrate for site-specific recombination of bacteriophage lambda.
mesh_terms: D010582:Bacteriophage lambda / Q000235:genetics*; D004270:DNA, Circular; D004278:DNA, Superhelical; D004279:DNA, Viral; D006860:Hydrogen Bonding; D009994:Osmolar Concentration; D011995:Recombination, Genetic
chemical_list: D004270:DNA, Circular; D004278:DNA, Superhelical; D004279:DNA, Viral