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Fig. 4. Effect of Stx1-B subunit on the distribution of paxillin and FAK in ACHN cells. ACHN cells were examined as described in Fig. 2 using Alexa-488-labeled anti-paxillin mAb (left panels, green) and Alexa-546-labeled anti-FAK Ab (center panels, red). The arrowheads indicate the areas of paxillin and FAK colocalization (yellow). Results are representative of three independent experiments.