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Acquisition of second-order fear requires the BLA, NMDAr, and NR2Br activation in the BLA (experiment 2). Drug-treated rats are shown with filled squares, and vehicle-treated rats are shown with open squares. Mean + SEM levels of freezing to S2 and S1 across second-order conditioning (left and middle panels) and at S2 test (right panel) for muscimol- and vehicle-treated rats (A), MK-801- and vehicle-treated rats (B), ifenprodil- and vehicle-treated rats (C).
