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FITC-transferrin uptake. FITC-transferrin was bound to the basolateral surface of control (a) and JAS-pretreated (b) MDCK cells at 4°C and then internalized for 15 min at 37°C. Small punctate FITC-transferrin-labeled compartments were present at similar levels in the basolateral cell periphery of both control (a) and JAS-pretreated (b) cells. Bar, 10 μm.
