Effect of methanol, ethanol, propanol, and butanol on vesicle fusion rates when added to the cis chamber. Fusion rates are presented as a percentage of the control experiment (before addition of alcohol). Light gray bars are for 0.4% v/v alcohol and dark gray bars are for 3.8% v/v alcohol. Ethanol and propanol similarly enhanced fusion rates at each dose. Butanol slightly enhanced fusion rates at the higher dose. In contrast, methanol did not significantly enhance fusions, but actually reduced fusion rates at 0.4% v/v. Error bars are mean ± SE; additional details are given in Table 1. P-values (compared with control): ∗ < 0.05, ∗∗ < 0.01.