Figure 6.

Revised pathway of phenylpropanoid biosynthesis in Arabidopsis including the reactions now known to be catalyzed by F5H and COMT (boxed in gray). The enzymes and their abbreviations are caffeoyl CoA O-methyltransferase (CCoAOMT), cinnamate 4-hydroxylase (C4H), cinnamoyl alcohol dehydrogenase (CAD), cinnamoyl CoA reductase (CCR), p-coumarate 3-hydroxylase (C3H), 4-(hydroxy)cinnamoyl CoA ligase (4CL), ferulate 5-hydroxylase (F5H), p-coumaroyl CoA 3-hydroxylase (pCCoA3H), phenylalanine ammonia-lyase (PAL), caffeic acid/5-hydroxyferulic acid O-methyltransferase (COMT).