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(A to D) Autophagosomes (double-membrane structures) with A. baumannii cells replicating within them. (A) TEM of RAW 264.7 macrophages incubated for 12 h with A. baumannii ATCC 17978; (B) group of intact bacteria enclosed by double membranes in RAW 264.7 macrophages; (C and D) individual bacterium surrounded by double membranes (arrows) in RAW 264.7 macrophages.
