CD157 KO mice that received repeated selegiline (1 mg/kg daily for 3 days) showed a tendency toward a higher number of entries into the center zone than those that received saline (P = 0.111; Figure 3A), suggesting that selegiline, administered repeatedly, has a tendency to reduce the elevated anxiety levels in CD157 KO mice placed in a novel environment. This evidence concerns the gene BST1 and Anxiety.