Fig. 9. Lungs from newborn MMP-2^-/- mice phenocopy branching defects in Egfr^-/- mice. HandE stained sections from lungs of newborn (a) MMP-2^-/-, (c) Egfr^-/-, (b,d) their wild type littermate controls, respectively. Note that the distal airway phenotype of MMP-2^-/- mice resembles that of the Egfr^-/- mice. Bar, 200 µm (a-d).