| http://www.w3.org/ns/prov#value | - These secondary plant metabolites are widely distributed in various species of the higher plant kingdom and may be extracted from numerous plant materials and tissues, such as, pine bark, lemon tree bark, grape seeds, grape skins, grape stems, cranberries, green tea, hazel nut tree leaves, blue berries, cherries, strawberries, apples and other fruits and plants including grains such as barley and
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