SUCCINATE 



-2H. 



-> FUMARATE 



KETO GLUTARATE 



+ H2O 



MALATE 



-2H 



OXALOACETATE 



-CO- 



CITRATE <- 



ADDITION 



PRODUCT 



X 



TRIOSE 



rPYRUVIcl 

 L ACID ? J 



THE CITRATE CYCLE OF KREBS 



Textfigure 39. — One condensed represen- 

 tation of an organic acid cycle showing trans- 

 formations involving oxidation and reduction 

 reactions of possible interest in connection 

 with respiratory systems interrelated with salt 

 absorption. (From Stare and Baumann, 

 1939). 



