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Cytosolic phosphoglucose isomerase catalyzes the reversible interconversion of glucose 6-phosphate and fructose 6-phosphate (Tsuboi et al. 1958; Noltmann 1972; Bloxham and Lardy 1973). The active form of the enzyme is a homodimer (Read et al. 2001). Mutations in the enzyme are associated with hemolytic anemia (Xu and Beutler 1994).