Formation of siliceous spicules in the marine demosponge Suberites domuncula

@article{Mller2005FormationOS,
  title={Formation of siliceous spicules in the marine demosponge Suberites domuncula},
  author={Werner E. G. M{\"u}ller and Matthias Rothenberger and Alexandra Boreiko and Wolfgang Tremel and Andreas Reiber and Heinz C. Schröder},
  journal={Cell and Tissue Research},
  year={2005},
  volume={321},
  pages={285-297}
}
The siliceous skeleton of demosponges is constructed of spicules. We have studied the formation of spicules in primmorphs from Suberites domuncula. Scanning electron microscopy and transmission electron-microscopical (TEM) analyses have revealed, in the center of the spicules, an axial canal that is 0.3–1.6 μm wide and filled with an axial filament. This filament is composed of the enzyme silicatein, which synthesizes the spicules. TEM analysis has shown that spicule formation starts… 

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TLDR
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TLDR
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TLDR
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