Figure 4

Immunofluorescence staining of lung tissue sections of mice from P1 to P28: (A) Elastin (red)/Pecam1 (green). (B) Elastin (red)/Pdpn (green). *“finger-like” alveolar protrusions. (C) Elastin staining of P7 airway (a). Airway  smooth muscle cell layer is marked by arrows.