Relevant data used to make all main figures not included in the publication. The dataset consists of a Microsoft excel file with four sheets corresponding to figures 2-4 in the publication. Sheet 1: Human intruder test anxiety and behavioural scores, and relative serotonergic gene expression in each brain region of interest. Sheet 2: Human intruder test anxiety and behavioural scores for animals after receiving saline or citalopram amygdala infusions. Sheet 3: CS-directed response in the fear extinction paradigm. Sheet 4: Baseline response in the fear extinction paradigm. Please refer to the publication for other relevant details.