Fig. 3.

A, Electron micrograph of a 100-nm-thick cryosection of olfactory epithelium obtained by STEM. To preserve the physiological element distribution, this preparation was not stained. Structural details show differences in dry mass distribution and therefore are difficult to distinguish. B, Graphical representation of the main outlines that can be seen inA, showing mucociliary layer (MC), dendritic knobs (K), and supporting cells (S). Arrows point to the basal parts of sensory cilia. Scale bar, 1 μm.