Analysis of chloride transports in rat airway smooth muscle cells. A Immunofluorescence study of α-smooth muscle actin in tracheal smooth muscle cells from rat and B in the absence of primary antibody. Scale bars are 10 μm. C The stimulation of iodide efflux as a function of time was evoked by an hypo-osmotic challenge, 1 μM A23187 and cAMP agonists (10 μM forskolin + 30 μM genistein) in rat airway smooth muscle cells as compared to basal. D Summary of the relative rates presented as mean ± S.E.M. Basal was vehicle alone.