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(A) Genetic and restriction map of EcoRV RMC genes (modified from ref. 27). (B) Effects of the ecoRVC mutation on the restriction and modification activities. The ratio of the number of λ plaques on the test strain to that on DH5 (pBR322) is shown (Left). The λ phage grown in each strain was assayed on DH5 (pYNEC113) and DH5 (pBR322); the ratio of the number of plaques on these two strains is shown (Right). Measurements were carried out in duplicate in two separate experiments.
