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Originally proposed tricin biosynthetic pathway. FNSI, flavone synthase I; FNSII, flavone synthase II; F3'H, flavonoid 3'-hydroxylase; F3'5'H, flavonoid 3',5'-hydroxylase; and FOMT, flavonoid O-methyltransferase. In green: general phenylpropanoid pathway. In purple: flavonoid biosynthetic pathway. Dotted arrows: originally proposed tricin biosynthetic pathway.
