Expression of BAMBI in isolated AM and alveolar epithelial cells (Aminoethylcarbazole color substrate, results in red signals). A: unstimulated AM (600×), B: NTHI-1 stimulated AM (600×), C: control (600×). D: mRNA expression of BAMBI in AM (normalized to GAPDH). E: Expression of Bambi on A549 cells (red area: isotype control). AM = alveolar macrophages. n = 4.