Sodium/bicarbonate cotransporter which plays an important role in regulating intracellular pH (By similarity). Has been shown to act as a sodium/bicarbonate cotransporter in exchange for intracellular chloride (By similarity). Has also been shown to act as a sodium/biocarbonate cotransporter which does not couple net influx of bicarbonate to net efflux of chloride, with the observed chloride efflux being due to chloride self-exchange (By similarity). Controls neuronal pH and may contribute to the secretion of cerebrospinal fluid (By similarity). Reduces the excitability of CA1 pyramidal neurons and modulates short-term synaptic plasticity (By similarity). Required in retinal cells to maintain normal pH which is necessary for normal vision (By similarity). In the kidney, likely to mediate bicarbonate reclamation in the apical membrane of the proximal tubules (By similarity). Detected in dendrites and axon terminals of retinal OFF bipolar cells and in axon terminals of ON bipolar cells. In amacrine cells, located in the perikaryon. Also detected in basal and apical dendrites of hippocampal pyramidal cells. The N-terminal cytoplasmic domain is likely to have a high level of intrinsic disorder. N-glycosylated. Belongs to the anion exchanger (TC 2.A.31) family. Has been shown to act as a sodium/bicarbonate cotransporter in exchange for intracellular chloride (By similarity). Has also been shown to act as a sodium/biocarbonate cotransporter which is not responsible for net efflux of chloride, with the observed chloride efflux being due to chloride self-exchange (By similarity).