Fig. 4. High-power photomicrograph demonstrating immunohistochemical staining of SP-B in the developing lung of the snapping turtle. SP-B staining was detected in the cytoplasm of subsets of epithelial cells within the gas-exchange region of snapping turtles at day 61 of incubation (A), after pipping (B) and after hatching (C). Regions depicted here correspond to areas demarked by the arrows in the corresponding panels of Fig. 3. Scale bars, 20 µm.

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