The reductive pentose phosphate (Calvin-Benson) cycle. Enzymes: 1, ribulose-1,5-bisphosphate carboxylase/oxygenase; 2, 3-phosphoglycerate kinase; 3, glyceraldehyde-3-phosphate dehydrogenase; 4, triose-phosphate isomerase; 5, fructose-bisphosphate aldolase; 6, fructose-bisphosphate phosphatase; 7, transketolase; 8, sedoheptulose-bisphosphate aldolase; 9, sedoheptulose-bisphosphate phosphatase; 10, ribose-phosphate isomerase; 11, ribulose-phosphate epimerase; and 12, phosphoribulokinase.