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Ultrastructure and cytochemistry of the early calcification site and of its mineralization organic matrix in Paracentrotus lividus (Echinodermata: Echinoidea)
Ameye, L.; Compère, P.; Dille, J.; Dubois, P. (1998). Ultrastructure and cytochemistry of the early calcification site and of its mineralization organic matrix in Paracentrotus lividus (Echinodermata: Echinoidea). Histochem. Cell Biol. 110(3): 285-294. https://dx.doi.org/10.1007/s004180050290
In: Histochemistry and Cell Biology. Springer: Berlin; Heidelberg. ISSN 0948-6143; e-ISSN 1432-119X
Peer reviewed article  

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  • Ameye, L.
  • Compère, P.
  • Dille, J.
  • Dubois, P.

Abstract
    The ultrastructure and cytochemistry of skeleton formation sites prior to mineralization are described for the first time in echinoderms. These early sites are intracellular vacuoles located in syncytial pseudopodia of skeleteton-forming cells. They contain a mineralization organic matrix, which shows a calcium-binding ability and is framed in a tridimensional structure made of concentric layers bridged by radial threads. This organic matrix presents repetitive structures which could be implicated in mineralization control. Both the tridimensional organization of the organic matrix and its framing, before mineralization starts, question the current theories which suggest that the echinoderm organic matrix is soluble at the onset of mineralization and adsorbs on the forming crystal.

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