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Schematic representation of the gibberellin (GA) biosynthetic operon. Abbreviations for the genes in the arrows are: CYP, cytochrome P450; Fd, ferredoxin; SDR, short-chain alcohol dehydrogenase/reductase; IDS, isoprenyl diphosphate synthase; CPS, ent-copalyl diphosphate synthase; KS, ent-kaurene synthase; and isopentenyl diphosphate isomerase (IDI), which is not found in all copies of the operon in rhizobia; the arrow indicates the direction of transcription.
