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Apical F-actin, but not actin cables in the shank, is sensitive to disturbances of endomembrane trafficking. A, BFA treatment. B, Wortmannin treatment. The images shown are representative, chosen from more than 30 pollen tubes at each time point (for BFA: 20, 45, and 60 min; for wortmannin: 45, 60, and 90 min). Arrows indicate where the F-actin ring would be in control tubes. Scale bar = 20 μm. [See online article for color version of this figure.]
