The reversible interconversion of ribulose 5-phosphate and ribose 5-phosphate is catalyzed by cytosolic ribose 5-phosphate isomerase (Huck et al. 2004).
Verhoeven, NM, van der Knaap, MS, Salomons, GS, Struys, EA, Jakobs, C, Huck, JHJ
ribose-5-phosphate isomerase activity of RPIA [cytosol]
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