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The effect of oligomycins on the accumulation of calcein AM in P-gp over-expressing SW620 Ad300 cells analysed using flow cytometry. aFAR (fluorescence arbitrary ratio) = calcein fluorescence intensity (geometric mean) in the presence of 1–8 (20 μM) / phosphate buffer saline (negative control). Positive and negative controls are verapamil (20 μM) and PBS, respectively.
