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Fig. 12. Deposition of dark brown secretions on the cultured mantle fragments. A - fragment culture of pearl oyster mantle in glass flasks. Some of the mantle fragments in the culture flasks are colored dark brown by the secretions (arrowheads). B - a cross section of the fully colored fragment. The fragment (m) is entirely covered with dark brown membrane-like structures (arrowhead). Delafield's hematoxylin and eosin stain. Scale bars - 10 mm (A) and 1 mm (B), respectively. A is reprinted with permission from Shinju Monogatari, Popular Science, 124, Machii, 179 pp., Fig. 6.15, © 1995, Shokabo Publishing.

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