. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 274 S. V. NICOSIA AND J. M. SOWINSKI :•••. Figure 6. Ciliated cell of the urn cell complex (UCC). (A) Cross-section view of cilia revealing typical spoke-wheel morphology (large arrow) and microvilli (small arrow). (B) Longitudinal view of cilia and microvilli. Note filamentous extension from the core of a microvillus into ectoplasmic area (arrow). (C) Basal corpuscles (be) and prominent rootlets (arrow) of cilia. Note also individual filaments crossing the cytoplasm in various directions, ly, lysosome-like body. (D) Filamen
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 274 S. V. NICOSIA AND J. M. SOWINSKI :•••. Figure 6. Ciliated cell of the urn cell complex (UCC). (A) Cross-section view of cilia revealing typical spoke-wheel morphology (large arrow) and microvilli (small arrow). (B) Longitudinal view of cilia and microvilli. Note filamentous extension from the core of a microvillus into ectoplasmic area (arrow). (C) Basal corpuscles (be) and prominent rootlets (arrow) of cilia. Note also individual filaments crossing the cytoplasm in various directions, ly, lysosome-like body. (D) Filamentous bundles (fb) at the outer periphery of the ciliated cell. These prominent bundles run parallel to the cell membrane and correspond to the refractile concentric rows observed in the living UCC (see Fig. 2B). All scale bars: jim These studies have indicated that not only ciliated and vesicle cells but also a third cell population, so-called R cells, are integral components of the UCC (Reissig ct 1979; Bang and Bang, 1976. 1980). It has been suggested that R cells may slowly secrete a type of mucus that is selectively sticky for cell debris and foreign particulates (Bang and Bang, 1980). During exposure of a UCC to bacteria or to other foreign substances, R cells become. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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