Fig. 2. High-power photomicrograph demonstrating immunohistochemical staining of TTF-1 in the developing lung of the snapping turtle. TTF-1 staining was confined to nuclei of cells within the gas-exchange region and trabecular epithelium in 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. 1. Scale bars, 20 µm.

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