Figure 2From: Analysis of airway secretions in a model of sulfur dioxide induced chronic obstructive pulmonary disease (COPD)Secretory basal activity after 3 days of exposure. The tracheal secretory basal activity of 6 groups exposed to either 5, 10, 20, 40, 80 ppm SO2 or fresh air was assessed using a modified Ussing Chamber. Results are presented as mean ± SD cpm.Back to article page