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In vitro effect of the extract and the 1,7-dihydroxy-2,3-dimethoxy xanthone from Polygala cyparissias on the contractions induced by inflammatory mediators and ovalbumin in normal and actively sensitised trachea from guinea pig[J] . M. El Sayah,V. Cechinel-Filho,T. R. Pinheiro,R. A. Yunes,J. B. Calixto.Inflammation Research . 1999 (4)