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Histological examinations at 27 weeks. (A-D) Control group and (E-H) UPAL gel group. Low magnification of 3-mm diameter defects (A, E) and 5-mm diameter defects (C, G). Scale bar, 1 mm. High magnification of 3-mm diameter defects (B, F) and 5-mm diameter defects (D, H). Scale bar, 200 μm.
