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The activity of GDP-mannose pyrophosphorylase is lower in vtc1-1 than wt. Enzyme activity was measured in the reverse direction by PPi-dependent formation of 14C-mannose-1-P from GDP-[U-14C]mannose. The values are from assays of two independent leaf extracts per genotype. ▴, wt extracts; ○, vtc1-1 extracts.
