Fig. S1. The outward current in Purkinje cells of lobule 10 evoked by a tetanic molecular layer stimulation was not affected either by blockers of SK and BK channels, antagonists of P2 purinergic and adenosine receptors, an inhibitor of the glutamate transporter, intracellular BAPTA, or by a change in extracellular Cl concentration.

Fig. S2. The time to peak and the decay time course of the outward current was decelerated by NO711 (GAT-1 inhibitor) but not by SNAP5114 (GAT-2 and GAT-3 inhibitor).

Fig. S3. Baclofen-induced responses from Purkinje cells at depolarized holding potential.

Fig. S4. Current recordings of mutant KCNK13 channels, ΔN, N Ala, ΔC and C Ala in Xenopus oocytes evoked by voltage step pulses.

Fig. S5. GABA application induced current in Xenopus oocytes expressing GABAB receptors and KCNK13 channels.

Fig. S6. Only 1 out of 15 Purkinje cells in primary culture showed GABAB receptor activated outward current.

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