[A method for the preparation of relaxed closed circular DNA by "untwisting extracts" of mammalian chromatin (author's transl)].
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
D002457:Cell Extracts; D002843:Chromatin; D004270:DNA, Circular; D004264:DNA Topoisomerases, Type I