MAOA and Anxiety: Positive correlations were identified between MAO-A activity in the amygdala and the time spent in the closed arms of the EPM (r = 0.72; p < 0.05), MAO-A activity in the hippocampus and the freezing response (r = 0.69; p < 0.05), and MAO-A activity in the liver and the level of anxiety-related defecation (r = 0.79; p < 0.05).