The Calvin cycle is a metabolic pathway found in the stroma of the chloroplast in which carbon enters in the form of CO2 and leaves in the form of sugar. The cycle spends ATP as an energy source and consumes NADPH2 as reducing power for adding high energy electrons to make the sugar. There are three phases of the Calvin cycle. Phase 1 is called carbon Fixation. Phase 2 is called reduction. And phase 3 is called regeneration. All of these phases all lead to the regeneration of ATP and converting NADPH2. ATP left and NADPH2 right.
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