title: [A method for the preparation of relaxed closed circular DNA by "untwisting extracts" of mammalian chromatin (author's transl)].
mesh_terms: D000818:Animals; D002457:Cell Extracts; D002460:Cell Line; D002843:Chromatin; D004264:DNA Topoisomerases, Type I; D004270:DNA, Circular / Q000302:isolation & purification*; D008722:Methods; D051379:Mice
chemical_list: D002457:Cell Extracts; D002843:Chromatin; D004270:DNA, Circular; D004264:DNA Topoisomerases, Type I