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. 1998 May 26;95(11):6442–6447. doi: 10.1073/pnas.95.11.6442

Figure 6.

Figure 6

Effect of a resident BamHI RM system on the establishment of an incoming PvuII RM system. Cells carrying pYNEC403 (BamHI R+ M+ C+), pYNEC404 (BamHI R− M+ C+) or pBR322 were transformed with 90 ng of pYNEC323 (PvuII R+ M+ C+), pYNEC324 (PvuII R− M+ C+), pYNEC325 (PvuII R+M+ C−), or pYNEC333 (vector). Each DNA solution contained 60 ng of pYNEC332 (KmR) as an internal control of the transformation efficiency. For each assay, the number of ApR transformants was divided by the number of KmR transformants. The relative transformation efficiencies are the above ratios further divided by the ratio for pYNEC333. The measurements were carried out in duplicate in two separate experiments.