In an imaging genetic study, some genes were related with the amygdala activation elicited by anxiety or anxiety-related stimulation, such as SLC6A4 (solute carrier family 6 member 4), BDNF (brain-derived neurotrophic factor) val66met, MAOA (monoamine oxidase A), and COMT (catechol-O-methyltransferase) val158met [46]. This evidence concerns the gene SLC6A4 and Anxiety.