A possible mechanism for anxiolytic and antidepressant effects of alpha- and beta-amyrin from Protium heptaphyllum (Aubl.) March - Aragão, G F; Carneiro, L M; Junior, A P; Vieira, L C; Bandeira, P N; Lemos, T L; Viana, G S (Pharmacol Biochem Behav, 2006)