Figure 1.

Estimation of optimal basal tension level by exposure to 60 mM KCl for mouse tracheal segments, fresh and cultured for 1, 2, 4, 8, 16 and 32 days. The basal tension represents the tension applied to segments at which the strongest KCl-induced contraction occurred. Each point represents the mean of all segments tested with error bars representing s.e.mean (n=8).