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(A) Distribution of MSSA (pYK20) transformants of major MRSA genotypes and other lineages according to resistance phenotype, i.e., homogeneous class (Hom) or heterogeneous class 1, class 2 or class 3. (B) Distribution of MSSA transformants separated according to the presence (Bla+) or absence (Bla−) of β-lactamase.
