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The unique skeleton of siliceous sponges (Porifera; Hexactinellida and Demospongiae) that evolved first from the Urmetazoa during the Proterozoic: a review
Sponges (phylum Porifera) had been considered as an enigmatic phylum, prior to the analysis of their genetic repertoire/tool kit. Already with the isolation of the first adhesion molecule, galectin, it became clear that the sequences of the sponge cell surface receptors and those of the molecules forming the intracellular signal transduction path-5 ways, triggered by them, share high similarity to those identified in other metazoan phyla. These studies demonstrated that all metazoan phyla,doi:10.5194/bgd-4-385-2007 fatcat:bfy2fq6k7rg3xltbjl4h6zc7fa