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Figure 4


Fig. 4. STEM image of a 1 µm-thick, freeze-substituted section of Galaxea fascicularis showing the oral ectoderm (OE), mesogloea (m) and oral gastrodermis (OG). Elemental images of S and Ca are shown with concentrations (in mmol kg–1) represented by a grey scale. Numerous S- and Ca-containing mucocytes (mu) are present in the oral ectoderm and gastrodermis.