Aberrant-type cyst luminal surface. TEM micrograph of apical region of a high ciliated epithelial cell surrounded by flat microvilli-carrying cells (same specimen as in Figure 7). The two cell types meet in well-developed junctions. The blunt microvilli in the epithelial cell to the right have a constant length ending in a bulb-like widening, and carry a conspicuous fuzzy coat covering their surface (insert). Note also that the ciliated cell in addition to the obvious cilia also possesses numerous long and slender cytoplasmic extensions (mostly cross-sectioned) with a smaller diameter than the microvilli of the neighbouring cell.