
An ejectosome is a cellular organelle responsible for ejecting their contents from the cell. Two unrelated types of ejectosomes are described in the literature: Cryptomonad ejectosomes contain two connected spiral ribbon-like structures, held under tension. If the cells are irritated either by mechanical, chemical or light stress, they discharge, ...
Found on
http://en.wikipedia.org/wiki/Ejectosome

(from the article `algae`) ...Dinophyceae has harpoonlike trichocysts beneath the cell surface that can explode from a disturbed or irritated cell. Trichocysts may serve to ...
Found on
http://www.britannica.com/eb/a-z/e/15
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