Cell Communication; Epithelial Cells/cytology; Intracellular Signaling Peptides and Proteins/metabolism; Lung/cytology; Lung/embryology; Mammals/embryology; Morphogenesis; Adherens Junctions/drug effects; Adherens Junctions/metabolism; Animals; Cell Communication/drug effects; Cell Membrane/drug effects; Cell Membrane/metabolism; Cell Polarity/drug effects; Cytoskeleton/drug effects; Cytoskeleton/metabolism; Epithelial Cells/drug effects; Epithelial Cells/metabolism; Epithelium/drug effects; Epithelium/embryology; Epithelium/metabolism; Gene Knockdown Techniques; Imaging, Three-Dimensional; Lung/drug effects; Lung/metabolism; Mice; Models, Biological; Morphogenesis/drug effects; Morpholinos/pharmacology; Nerve Tissue Proteins/metabolism; Protein Binding/drug effects; Protein Transport/drug effects; Receptors, G-Protein-Coupled/metabolism; Tight Junctions/drug effects; Tight Junctions/metabolism; Zonula Occludens-2 Protein/metabolism; beta Catenin/metabolism; rhoA GTP-Binding Protein/metabolism