Effects of Rho kinase inhibition with Y-27632 on window contractions. A: “Steady-state” isometric contractions induced by depolarizations with cumulative K+ concentrations in the absence (control) and in the presence of 1 and 3 μM Y-27632. In B, force was normalized with values at 50 mM K+ as 100%. Results show mean ± s.e.m, n = 4. *, **, ***: P<0.05, 0.01, 0.001 versus control.