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Transmission electron microscopy images of OMVs isolated from paired polymyxin-susceptible and -resistant strains of K. pneumoniae ATCC 700721. (A) OMVs from untreated K. pneumoniae ATCC 700721 (susceptible). (B) OMVs from polymyxin B (2 mg/L) treated K. pneumoniae ATCC 700721 (susceptible). (C) OMVs from untreated K. pneumoniae ATCC 700721 (resistant). (D) OMVs from polymyxin B (2 mg/L) treated K. pneumoniae ATCC 700721 (resistant).
