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Fig. 2. A - presence of mucous cells (arrows) and cells with large acidophilic granules (arrowheads) in the outer epithelium. Cells with large acidophilic granules are also recognized beneath the outer epithelium. Giemsa stain. Scale bar - 50 μm. B - preparation of mantle fragments for pearl production. A ventral part of a mantle (v) is excised from a pearl oyster to prepare mantle fragments to be implanted. An inner side of the mantle is shown. After removal of the marginal zone (m), the remaining pallial zone (p) is cut into small pieces. Dark brown pigmentation is observable on the outer surface of the pallial zone (an arrow). B is reprinted with permission from Shinju Monogatari, Popular Science, 124, Machii, 134 pp., Fig. 5.9, © 1995, Shokabo Publishing.

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