Glutamine from the astrocytes is exported to the extracellular compartment via the system N amino acid transporter. The system N transporter is Na+ dependant transporter that has substrate specificity to aspargine, glutamine and histidine.
Pirozhkova, I, Gegelashvili, M, Gegelashvili, G, Zhang, J, Rodriguez-Kern, A, Sung, L
L-amino acid transmembrane transporter activity of SLC38A1 [plasma membrane]
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