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Pathways for the production of isoprenoid precursors: (A) The mevalonic acid (MVA) pathway. (B) A modified MVA pathway in Methanocaldococcus jannaschii. (C) The methylerythritol phosphate (MEP) pathway. (D) A newly discovered isoprenoid shunt pathway related to S-adenosylmethioneine metabolism. Two new activities found for IspF are shown in E.
