The last three committed steps in the pathway of starch biosynthesis are catalyzed by three enzymes,ADPG phosphorylase(AGPP),starch synthase and starch branching enzymes.

• 淀粉的合成在最后阶段涉及到3个关键性的酶是：ADPG焦磷酸化酶、淀粉合成酶以及淀粉分支酶。它们分别催化ADP-葡萄糖的形成、葡聚糖链的延伸以及分支链的形成。