Dynamic lung compliance (Cdyn) and lung resistance (Rrs) of Balb/c mice after bronchoprovocation testing with methacholine aerosol *, significantly greater than air controls (Rrs, P=0.0007; Cdyn,P<0.0001). The values shown on the graphs are the group mean percentage decrease in Cdyn, or the group mean percentage increase in Rrs from baseline values (without methacholine challenge) ± SE at the highest concentration of methacholine tested, with experimental group size, N, represented as a bracketed number above the bar.