The cell surface of A. proteus was stained with 2.68 µM 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindo-carbocyanine perchlorate (DiI) (ThermoFisher Scientific, USA) sprinkled in fresh medium for 10 min, and the cells were washed three times with fresh medium. The cells were further stained with 0.92 µM MitoTracker Deep Red FM (ThermoFisher Scientific) for 5 min and then washed three times with fresh medium.
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