F2RL1 and infection: This included more severe disorganized lung EpC layer (Figure 5A1) indicating concurrent cell damage and regeneration, EpC stretching/thinning (Figure 5A2) and total EpC loss (denudation, Figure 5A3), accumulation of neutrophils and cellular debris in the airway lumen compared to infected Par2-/- mice (Figure 5B) which showed only infection-induced disorganization of the EpC layer (Figure 5B1).