Efficacy of an Hypericum perforatum (St. John’s wort) extract in preventing and reverting a condition of escape deficit in rats. - Gambarana,C.; Ghiglieri,O.; Tolu,P.; De Montis,M.-G.; Giachetti,D.; Bombardelli,E.; Tagliamonte,A. (Neuropsychopharmacol, 1999)