Abstract
Soluble organic matrix (SOM) synthesis and secretion were investigated in two scleractinian corals using antibodies raised against this organic matrix. Results demonstrate that even if other cell types, including zooxanthellae, can supply precursors for SOM synthesis, only calicoblastic cells facing the skeleton are directly responsible for the synthesis and secretion of the SOM components. Results also indicate that, as is the case for other biominerals, skeleton formation is biologically controlled and not chemically dominated as originally believed. In addition to advancing the understanding of mechanisms of coral biomineralization, these antibodies could have numerous applications: for example as markers of skeletogenesis, as tools for cell culture, and in comparative studies among calcifying organisms.
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