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Protection of cytosines in CCWGG by PspGI. The frequency of KanR revertants following DNA incubation in the presence of different amounts of PspGI is shown. The ratio, number of protein dimers:number of PspGI sites in DNA, is shown below the bar graph. Whether or not the DNA was incubated at 75°C is also indicated below the graph by plus (+) and minus (−) signs.
