The reversible conversion of GA3P (glyceraldehyde-3-phosphate) to DHAP (dihydroxyacetone phosphate) is catalyzed by cytosolic TPI1 (triose phosphate isomerase) (Watanabe et al. 1996; Lu et al. 1984).
Watanabe, M, Zingg, BC, Mohrenweiser, HW
Gracy, RW, Yuan, PM, Lu, HS
triose-phosphate isomerase activity of TPI1 dimer [cytosol]
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