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Isoprenoid pathway in plants. Plant growth regulators and some enzymes of the pathway are circled. HMGR and PSY are highlighted in gray because of their possible rate-limiting roles. The steps catalyzed by PDS, FTase, and GGTase are also indicated. FPP and GGPP are the main branch points of the pathway. The alternative Rohmer pathway for the production of IPP in plastids is also indicated.
