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A and B: representative recordings under voltage-clamp conditions showing that application of 20 μM gabazine (GBZ) did not detect a tonic GABA current; however, application of 100 μM picrotoxin (PTX) did, causing a significant positive shift from baseline current. C: a similar positive shift was revealed after application of 1 μM strychnine. Results are summarized in D (**P < 0.005, ***P < 0.001).
