In Vitro Binding Studies with Two Hypericum Perforatum Extracts - Hyperforin, Hypericin and Biapigenin - on 5-HT6, 5-HT7, GABAA/Benzodiazepine, Sigma, NPY-Y1 /Y2 Receptors and Dopamine Transporters - Gobbi, M; Moia, M; Pirona, L; Morazzoni, P; Mennini, T (Pharmacopsychiatry, 2001)