Extrusome
[1] Nematocysts, the stinging structure found in Cnidarian animals, could be considered extrusomes as well, though those functions are performed by differentiated cells rather than organelles.[3] Expulsion of the trichocyst is generated by a change in the structure of proteins within the shaft of the projectile that drastically increases its length.This additional layer may serve as a barrier against foreign substances; it may also be re-ingested alongside any organic matter that was captured within.Though long believed to be genetically dissimilar, recent studies of ribosomal DNA have yielded evidence towards them being more related despite the physiological differences.When the hair-like trigger called the cnidocil receives a chemical or mechanical input, the coiled hollow tube within is ejected, piercing and injecting the target organism with toxin.