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Behavioral effects of methylene blue on the extinction of conditioned freezing. (A) Mean ± SE freezing scores (CS - preCS freezing counts) after 2 d of acquisition training before the onset of MB/saline treatments. (B) Mean ± SE total postextinction freezing scores in the MB-treated and saline-treated groups. (C) Mean ± SE freezing scores in the MB-treated and saline-treated groups in postextinction probes I to V. Asterisks indicate significant differences at P < 0.05.
