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Fig.1. Microtubules (Mt) and tubulin paracrystals (T) in canal ectoplasm of Assilina ammonoides (Gronovius). TEM micrograph, courtesy S. Reber-Leutenegger, x 24,000. B: bacteria; M: mitochondria; Mt: microtubule; Pl: plasmalemma; T: tubulin paracrystals; V: vacuoles with or without fibrillar content (waste products?); (Hottinger, 2006; fig. 67 [1] CC/BY-NC-SA)


  • according to Hottinger (2006):

MICROTUBULE - polymerized heterodimers of alpha and beta tubulin in helicoids that form long, straight cylinders reinforcing the pseudopodial ectoplasm of the pseudopods and the plasmatic content of interlocular spaces, i.e. canal systems. May depolymerize and form paracrystals in the chamber plasm. The paracrystals are believed to be the reservoir that feeds the polymerization when pseudopods expand through an orifice into the ambient environment.

See also


Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744.

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