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(A) SDS-PAGE results of OMP proteins in K. pneumoniae. 1 and 6, carbapenem-sensitive strains; 2–5, carbapenem-resistant strains; M, molecular weight marker. (B) SDS-PAGE results of OMP proteins in C. freundii. 1, carbapenem-sensitive strain; 2–7, carbapenem-resistant strains; M, molecular weight marker. (1) OmpC protein (42 kDa); (2) OmpF protein (39 kDa). OMP, outer membrane porin; K. pneumoniae, Klebsiella pneumoniae; C. freundii, Citrobacter freundii.
