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Bracken (Pteridium aquilinum) has long been known to cause cancer in farm and laboratory animals. Ptaquiloside, a norsesquiterpene glycoside found in bracken, is considered its main carcinogenic toxin and is capable of inducing tumours in a variety of organ systems, but especially in the urinary bladder, depending on the animal species, the administration route employed and the duration of exposure...
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