Protein expression of BAMBI in human lung tissue (IHC, representative samples, red signals are indicated by arrows). Induction of BAMBI by in vitro infection of NTHI-1 (A, 400×), Medium (B, 400×). Induction of BAMBI by in vitro infection of NTHI-2 (C, 400×), Medium (D, 400×). Expression of BAMBI in COPD lung tissue with (E, 400×) and without (F, 400×) NTHI detection. IHC = Immunohistochemistry.