co n 



(Malonate) ^ 



Oxalacetate \ 

 decarboxylase \ 



(Pyruvate) 

 \ 



oxidation 



C0 2 + H 2 



(Oxalacetate) 



(DPNH) 



Malic | 



dehydrogenase | 



(DPN) 



(Citrate) 

 \\ 



(Isocitrate) 



(TPN) -A\^ 



(TPNH)< ^\\ dehydrogenase 



Isocitric 



(Malate) 

 \' 



Fumarase 



( oC - Ketoglutarate) 



/A 

 // 



v; 



(Succinate) 



V 



'/ 



V" 



(Fumarate)' 



Succinoxidase 



Electron transport 

 system 



o„ 



Cytochrome 

 oxidase 



H 2° 



Figure 6. Known tricarboxylic acid cycle in oysters. 



