
Arctiin is a lignan found in many plants of the Asteraceae family, particularly the greater burdock (Arctium lappa) and Centaurea imperialis, and in Trachelospermum asiaticum, Saussurea heteromalla., and Forsythia viridissima. It is the glucoside of arctigenin. Arctiin and arctigenin have shown anticancer effects. ...
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http://en.wikipedia.org/wiki/Arctiin

A substance found in certain plants, including burdock. It has shown anticancer effects. Arctiin belongs to a group of substances called lignans.
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http://www.cancer.gov/dictionary?expand=A
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