Typical examples of the staining patterns of 500 kDa and 2,000 kDa dextran-FITC. A, Image showing 500 kDa dextran-FITC staining. The arrow is pointing to the region of Hensen cells where strong dextran-FITC fluorescence is present. The structure that shows weak fluorescence at the top portion of the image is the tectorial membrane (indicated by the asterisk). B, An image showing 2,000 kDa dextran staining. No accumulation of dextran-FITC fluorescence is present in the organ of Corti. Bar: 20 μm.