Blockade of glutamate transport does not reveal a slow component to mEPSC_fast. A, Example EPSC traces from a cell in normal extracellular medium (2.5 mm Ca²⁺, 0 mm Sr²⁺; top averaged trace), in Sr²⁺ (0 mm Ca²⁺, 2 mm EGTA; middle single trace), and Sr²⁺ plus TBOA (0 mm Ca²⁺, 2 mm EGTA, 20 μm TBOA; bottom single trace). B, Averaged evoked mEPSC_fast in Sr²⁺ (left), Sr²⁺ plus TBOA (middle), and scaled and superimposed (right). Gray lines are single-exponential fits. C, Summary data for mEPSC_fastτ_decay and 10-90% rise time (left) and amplitude (right) in the presence of Sr²⁺ (black; n = 8) and in Sr²⁺ plus TBOA (gray; n = 8).