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Schematic of flavonoid biosynthesis in Arabidopsis. CHS catalyses the first committed step in this pathway. Three general classes of end product are produced in Arabidopsis: flavonols, anthocyanins, and proanthocyanidins (or condensed tannins). Enzymes are indicated in bold, with the corresponding genetic loci in parentheses. FLS, flavonol synthase; LDOX, leucoanthocyanidin dioxygenase.
