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N-methyl-d-aspartic acid receptor blockade in the amygdala has no effect on ERK phosphorylation in the mPFC related to extinction training. (A) Schematic showing the behavioral procedures employed in this experiment. (B) Freezing to the CS during the 40 trials of extinction training. Expression of phosphorylated ERK in the amygdala mPFC (C) of rats infused with saline (N = 8, black) or CPP (N = 8, blue) into the amygdala and given 40 trials of extinction training.
