Catalyzes the reversible epimerization of D-ribulose 5- phosphate to D-xylulose 5-phosphate. RPEcyt MAAAAAAKIAPSMLSSDFANLAAEADRMVRLGADWLHMDIMDGHFVPNLTIGAPVIQSLRKHTKAYLDCHLMVTNPSDYVEPLAKAGASGFTFHIEVSRDNWQELIQSIKAKGMRPGVSLRPGTPVEEVFPLVEAENPVELVLVMTVEPGFGGQKFMPEMMEKVRALRKKYPSLDIEVDGGLGPSTIDVAASAGANCIVAGSSIFGAAEPGEVISALRKSVEGSQNKS Cyt-RPEase Os09g0505700 LOC_Os09g32810 Pentose-5-phosphate 3-epimerase Os09g0505700 Ribulose-5-phosphate-epimerase 228 Ribulose-phosphate 3-epimerase, cytoplasmic isoform RPE1_ORYSJ