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Effect of acute (A) glutamate (0.01-10 mM), (B) cocaine (0.01-3 mM), or (C) GABA (0.01-25 mM) administration on planarian activity. Data are expressed as mean activity counts ± S.E.M. during 1-min of drug exposure. **p < 0.01 compared to water control. N = 8 planarians per group.
