ι
carboxydismutase
s y s t em
H
2C - 0 ®
2
p
Ο
2
S U C R O S E
p h o s p h o k e t o p e n t o se e p i m e r a se
H C - O H
H
2C - 0 ®
X Y L U L O S E - 5 - P
t r a n s k e t o l a se
FIG. 2. The photosynthetic carbon reduction cycle or the reductive pentose phosphate cycle.