Main Page | See live article | Alphabetical index The extrusomes of cryptomonads are called ejectisomes (or ejectosomes). The ejectisomes occur in two sizes in the unicells: as small ones underneath the cell surface and as larger ones (visible under a light microscope) lining a cell invagination called gullet or furrow depending in its shape. Each ejectisome consists of two spiral ribbons connected with each other. The ribbons are under tension. If the cells are irritated either by mechanical, chemical or light stress, they discharge their ejectisomes and the cells try to escape from the source of danger by jumping away in a zig-zag course. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.