Immunofluorescent detection of FBG in lung epithelial cell ECM. A549 cells grown on glass coverslips were treated with IL-6 and DEX for 18 hours (B through D) or untreated (A), fixed, and then stained with the following antibodies: (A and B) MoAb J88B for FBG; (C) PoAb for FN; and (D) MoAb COL-94 for collagen type IV. The bar in (D) represents 10 μm.