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The inhibition of SAH on caffeoyl CoA O‐methyltransferase (CCoAOMT) and caffeic acid O‐methyltransferase (COMT) enzyme activities. Crude enzyme extracts were prepared from the stems of wild‐type switchgrass plants at the E4 stage, and the extractable CCoAOMT (a) and COMT (b) enzyme activities were assayed with 10 μm caffeoyl CoA and 10 μm caffeic acid, respectively, at different SAM and SAH concentrations. Values are means ± SE (n = 3).
