Figure 2.

Repeated KCl-induced contractions of BTSM strips incubated for 18 h with vehicle or 10 μM fenoterol. A first vehicle-treated control group was subjected to two successive contractions in the absence of timolol. A second control group was first contracted in the absence of timolol, followed by a contraction in the presence of 1 μM timolol. Fenoterol-incubated strips were subjected to two successive contractions in the absence of timolol. Results are means±s.e.mean of 5–6 experiments.