Functional properties of UCPH-101 at GLAST mutants containing mutations of the Gly120, Ala123, Tyr127, Met251, Phe255, Phe389, and Val393 residues. Concentration–inhibition curves for UCPH-101 at WT GLAST and the GLAST mutants stably expressed in polyclonal HEK293 cells in the [3H]-d-Asp uptake assay (n = 3–5).