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Fig. 5. DNA synthesis in allografts and pearl sacs. BrdU-labeled nuclei (colored brown) were visualized with anti-BrdU monoclonal antibody and horseradish peroxidase-conjugated second antibody. Black arrowheads indicate BrdU labeling in the epithelial cells. A - a mantle allograft (a) on day 4 (an adjacent section of Fig. 3C). Inset, enlargement of the epithelium shown by a right black arrowhead. Note active labeling of the nuclei. A white arrowhead indicates absence of BrdU labeling in the central part of the allograft. B - labeling of leading squamous epithelial cells on day 4. C, D - labeling of pearl-sac epithelial cells on day 14 (C) and day 21(D). b - the place in which the bead was located; o - ovary; t - testis. Scale bars - 160 μm (A), 80 μm (B, D), 40 μm (C), respectively.

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