Tonic Inhibition: Neuronal inhibition has recently drawn much attention; however, the mechanisms involved in tonic release of and the cellular source of the neurotransmitter involved, γ-aminobutyric acid (GABA), have been difficult to pin down. Lee et al. (p. 790 , published online 23 September) showed that tonic release of GABA in the cerebellum occurs through the Bestrophin 1 anion channel of cerebellar astrocytes and Bergmann glial cells. These results confirm that glia can serve as a source of GABA for tonic inhibition of neurons and provide more evidence for interactions between neurons and glia cells that have implications for our understanding of brain-signaling mechanisms.