Schematic illustration of the dialysis experiments.  500 μg BDP ex-valve is applied to human lung homogenate.  Dialysis membrane is placed on homogenate, the dialysis unit is closed by attaching the second chamber, and the second chamber is filled with human plasma.  Sampling aperture is closed and the dialysis unit is incubated by 37°C.  Sample of 500 μl is drawn and the volume is replaced with fresh plasma.