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Fig. 9. Decalcified pearls and adjacent pearl-sac epithelia. A–C - decalcified nacreous (A), prismatic (B), and organic (C) pearls and adjacent pearl-sac epithelia. Arrowheads in A - cells with large acidophilic granules; arrowheads in C - epithelial cells with acidophilic granules in the cytoplasm. n - nacreous layer; p - prismatic layer; o - organic layer; e - pearl-sac epithelium; m - mucous cell. D - a decalcified nacreous pearl and surrounding tissue. b - the space in which the bead was located. m - shell matrix of the implanted bead; o - organic matrix; p - prismatic layer; n - nacreous layer; e - pearl-sac epithelium; t - testis; d - digestive diverticula. Arrowhead - a transition layer between prismatic and nacreous layers. Scale bars - 20 μm (A), 150 μm (B), 250 μm (C) and 1 mm (D), respectively. D is reprinted with permission from Shinju Monogatari, Popular Science, 124, Machii, 161pp., Fig. 6.7, © 1995, Shokabo Publishing.

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