. "Edited: D'Eustachio, P, 2008-06-02 20:10:30"^^ . "Authored: D'Eustachio, P, 2008-06-02 20:10:30"^^ . "Reviewed: Jassal, B, 2008-06-03 13:06:01"^^ . "SLC1A4, associated with the plasma membrane, mediates the exchange of cysteine and an extracellular sodium ion for a cytosolic sodium ion and any one of the four amino acids alanine, serine, threonine, or cysteine (Zerangue and Kavanaugh 1996)."^^ . . . . . . . . "SLC1A4-mediated exchange of extracellular cysteine for cytosolic alanine, serine, or threonine"^^ . . . . . . . . .