Figure 1.

The carbon dioxide that enters the Calvin–Benson cycle is metabolized primarily to starch and sucrose (lines on right side of the figure). Since both sucrose and starch synthesis can be readily traced back to the triose phosphates, this is often called triose phosphate utilization. PGA, 3-phosphoglycerate; TPI, triose phosphate isomerase; GAP, glyceraldehyde 3-phosphate (distinguished from glycerol 3-phosphate denoted G3P); DHAP, dihydroxyacetone phosphate; G6P, glucose 6-phosphate; F6P, fructose 6-phosphate; FBP, fructose 1,6-bisphosphate; E4P, erythrose 4-phosphate; glyco-TDP, glycoaldehyde thiamine diphosphate; SBP, sedoheptulose 1,7-bisphosphate; S7P, sedoheptulose 7-phosphate; R5P, ribose 5-phosphate; Xu5P; xylulose 5-phosphate; Ru5P, ribulose 5-phosphate.