Sodium-dependent, high-affinity amino acid transporter that mediates the uptake of L-glutamate and also L-aspartate and D-aspartate. Functions as a symporter that transports one amino acid molecule together with two or three Na(+ ions and one proton, in parallel with the counter-transport of one K(+ ion. Mediates Cl(- flux that is not coupled to amino acid transport, this avoids the accumulation of negative charges due to aspartate and Na(+ symport (By similarity. Plays a redundant role in the rapid removal of released glutamate from the synaptic cleft, which is essential for terminating the postsynaptic action of glutamate (Probable.,SLC1A6,EAAT4,Neuroscience,SLC1A6