Figure 1
From: Molecular architecture of the fruit fly's airway epithelial immune system
Organization of the fruit fly's airway epithelium. The airway system of the Drosophila larvae is made of simple tubes in a hierarchical order (D, modified after [31]). In all airways, starting from the primary (A) over secondary (B) up to terminal branches (C), a single layer of epithelial cells wraps around the central air-filled tube. If confronted with bacteria (Erwinia carotovora or Pseudomonas aeruginosa), the airway epithelium reacts with the expression of antimicrobial peptides (visualized using a drosomycin::gfp reporter, E). All cells, even the most terminal structures, are able to mount an immune response (arrow, F).