Figure 1.

Isometric contraction of BTSM strips by increasing concentrations of KCl in the absence and subsequent presence of 1 μM timolol, after pre-incubation of the strips with vehicle or 10 μM fenoterol for 5 min, 30 min and 18 h, followed by thorough washout of the agonist. Results are means±s.e.mean of seven experiments.