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Stoichiometry of the Calvin cycle

Description
In six turns of the Calvin cycle, 6 CO2 molecules will have entered and bound to 6 RuBP to yield 12 GAP.

Because GAP is in isomeric equilibrium with DHAP, the 12 GAP may be considered an interconvertible stock of 12 (GAP-DHAP).

Of these, 6 are used to make 3 FBP, of which one constitutes the net hexose product of the 6 turns.

The other 2 FBPs are used, together with the 6 remaining molecules of (GAP-DHAP), to form 6 Ru5P, which are then phosphorylated to regenerate the required 6 RuBP.
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