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“In all cases, these responses were reduced by removing calcium from the saline and surangin B-evoked release of GLU , GABA, aspartic acid (ASP) and alanine was significantly inhibited by the sodium channel blocker tetrodotoxin.”
“The stimulating effect of L-glutamic acid was still observed in the presence of tetrodotoxin (5 · 10−7 M), suggesting that the amino-acid acts at a presynaptic site.”