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Proposed D-arabitol pathway in tobacco chloroplasts. ARDH reduces D-ribulose to D-arabitol where D-ribulose is derived by dephosphorylating D-ribulose-5-PO4 in the oxidized pentose pathway. Nevertheless, phosphorylation of D-ribulose-5-PO4 results in D-ribulose-1,5-bisPO4 that enters into Calvin cycle.
