The GLAST inhibition exerted by UCPH-101 is an intramolecular event. A, The potential GLAST trimer combinations formed in cell populations transfected with four different pairwise combinations of WT GLAST, GLAST-G120L, GLAST-R479T, and GLAST-G120L/R479T cDNAs. B, Concentration-inhibition curves for Glu, TBOA, and UCPH-101 at tsA201 cells transfected with different combinations of WT GLAST, GLAST-G120L, GLAST-R479T, and GLAST-G120L/R479T cDNAs (1:1 transfection ratios) in the [3H]-d-Asp uptake assay (n = 4).