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Anthocyanin biosynthesis pathway in petunia. Enzymes are indicated in capital letters and the names of the genetic loci encoding these enzymes are indicated in italics. CHS, Chalcone synthase; CHI, chlacone-flavaonone isomerase; DFR, dihydroflavonol 4-reductase; ART, anthocyanin-rhamnosyltransferase.
