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“Under both conditions, KCl and 4-aminopyridine (agents with specificity toward the calcium-dependent pool) produced elevated glutamate (but not GABA) release when glutamine was included.”
“Perfusion with 20-75 mM 4-AP for 12.5 min resulted in a massive increase in extracellular glutamate (up to 20-fold), smaller increases in aspartate and taurine (up to 10-fold) and slight increments in glutamine , alanine, glycine and GABA.”