Figure 3

Distribution of PECAM-1 and α-sma proteins in the mouse fetal lung. Mouse tissue sections isolated on GD 17.5 were subjected to immunohistochemistry using anti-PECAM-1 (A, B) or anti-α-sma (C, D) as primary antibodies. Capillaries are PECAM-1-positive. Specific staining is clearly different between the two antibodies and only the staining pattern obtained with the anti-PECAM-1 corresponds to positive signals obtained with the anti-LPL antibody in Figure 2. Scale bars, 80 μm (A, C), 20 μm (B) or 40 μm (D). C, capillaries.