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The amygdala is one of the crucial brain structures for conditioned fear, in which conditioned stimuli are received by the basolateral nucleus of the amygdala (BLA), inducing a fear reaction via the central nucleus of the amygdala (CeA). Whereas BLA sends glutamatergic projections into CeA, the intercalated nucleus of the amygdala (ITC) sends GABAergic projections into CeA, which is doubly regulated...