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Figure 10


Fig. 10. High-resolution NanoSIMS image of a 2 µm-thick, freeze-substituted section of Galaxea fascicularis after 1 min incubation in 44Ca artificial seawater in the light. The 44Ca/40Ca ratio image (A) and line profile (B) indicate that 44Ca had reached a high relative concentration in the unspecialised oral ectodermal cells but little exchange had occurred in the mucocytes (Mu) or cnidocytes (Cn). Natural (unenriched) levels are also indicated. SW, external seawater layer. In B the ratio 44Ca/40Ca along B–A in (A) is plotted against distance (µm).





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