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Outline of the two isoprenoid biosynthetic pathways in an Arabidopsis cell: the MVA and MEP pathways. Blue arrows indicate metabolic flow between the cytosol and plastid. Two genes, HMG1 and HMG2, encoding HMGR are shown in red letters. MVA, mevalonate; IPP, isopentenyl diphosphate; DMAPP, dimethylallyl diphosphate; GAP, glyceraldehyde 3-phosphate.
