The time course of CA1 field potential amplitudes (fEPSP) is illustrated in B. Taurine-induced long-lasting enhancement (LLETAU) of synaptic field responses in control (▪) is unchanged in the presence of the taurine uptake inhibitor guanidinoethyl sulphonate (GES, ▪). Times of taurine (TAU, 10 mm) and GES applications are indicated by horizontal bars. Abbreviations in A: CX, cortex; CS, corpus striatum; GP, globus pallidus; Th, thalamus; HPC, hippocampus.