混合液に含まれるもの A. nicled circular plasmid DNA B. relaxed, covalently closed plasmid DNA C. covalently closed plasmid DNA, sigma=+0.05 D. covalently closed plasmid DNA, sigma=+0.15 E. covalently closed plasmid DNA, sigma=-0.05 F. covalently closed plasmid DNA, sigma=-0.15