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The behavioural effects of an extract of Cassia siamea, a plant used in Thai traditional medicine, and barakol, its active chemical, were studied on an elevated plus-maze compared with diazepam. An aqueous extract of C. siamea (1, 6, and 12 g/kg body wt., orally) produced a small increase in the percentage of the open : total number of arm entries and time, time spent on the end of the open arms,...