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Biosynthetic pathway of selected lignans in different plant species. 1 = laccase, 2 = dirigent protein, 3 = CYP81Q3 in S. alatum [89], 4 = PLR1 in L. perenne [243], 5 = SDH in F. intermedia [244], 6 = CYP719A23 in P. hexandrum [249], 7–12 = OMT3, CYP71Cu1, OMT1, 2-ODD, CYP71BE54 and CYP82D61 in P. hexandrum, 13–14 = DOP6H, βP6OMT in L. flavum. Identified and postulated conversions are represented by solid and broken lines, respectively. Two arrows indicate several consecutive steps.
