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Sketch of the flavonoid biosynthesis pathway. Bold arrows indicate the different steps leading to flavonoid formation. Names of mutants affected in the biosynthetic process are written in lowercase. CHS, Chalcone synthase; CHI, chalcone isomerase; F3H, flavonol 3-hydroxylase; F3′H, flavonol 3′-hydroxylase; DFR, dihydroflavonol-4-reductase; LDOX, leucoanthocyanidin dioxygenase. Adopted from Routaboul et al. (2006).
