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The potential inhibitory effect of 54 Mexican Indian medicinal plants on the activation of transcription factor NF-κB was studied. Band-shift experiments identified the ethanolic leaf extracts of Artemisia ludoviciana ssp. mexicana, Calea zacatechichi, and Polymnia maculata (all rich in sesquiterpene lactones) as inhibitors of NF-κB down to a concentration of 25 μg/ml. The sesquiterpene lactones isohelenin...
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