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High-resolution SEMs of mature, confluent HT-29 enterocytes. (A) Untreated enterocytes with relatively uniform apical microvilli and closely apposed enterocyte borders; (B) enterocytes incubated for 1 h in medium supplemented with 1 μg of cytochalasin D per ml, showing separation of individual enterocytes and grossly distorted apical microvilli. Scale bar, 0.5 μm.
