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Extinction of sensory preconditioned fear requires the BLA, NMDAr, and NR2Br activation in the BLA (experiment 7). Mean + SEM levels of freezing across S2 extinction (left panel) and at S2 test (right panel) for muscimol (filled squares), MK-801 (filled circles), ifenprodil (open/filled circles), vehicle (open squares), and nonextinguished (open circles) rats.
