Figure 4From: Secondhand smoke inhibits both Cl- and K+ conductances in normal human bronchial epithelial cells Filtered SHS does not reduce forskolin-stimulated Cl - secretion. A 2 μm Teflo air sampling filter (Pall Corporation) was placed over the inlet port of the exposure chamber. With the filter in place, 180 min SHS exposure (5 ppm CO) had no effect on forskolin-stimulated Cl- secretion.Back to article page