Comparison of effects of WIN55,212-2, ∆9-THC, CBD, CP55,940, and rimonabant on GIRK1/2. ≈100 μM of WIN55,212-2 and 100 μM of CBD, CP55,940, and rimonabant reduced inward K+ currents, while 100 μM ∆9-THC slightly enhanced inward K+ currents. The positive percentage represents enhancement and the negative percentage represents reduction. Statistical comparisons between the various experimental groups were performed by Dunnett’s multiple comparisons test of one-way ANOVA where p < 0.05 was considered significant. ****, p < 0.0001 vs. percentage for WIN55,212-2. Each data point is the mean ± SD of three determinations from two or three batches of oocytes.