Extrusome
From Palaeos.org
An ejectable organelle, located within the cell; the contents of which can be extruded. Extrusomes may be used for protection or prey capture. Extrusomes are frequently located at more or less fixed locations adjacent to "oral" structures. In Ciliophora, the extrusomes can rapidly eject short threadlike structures. These extrusomes function in predation, defense, and in forming cysts in various ciliates.
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