222 E. C, SLATER, M. J. BAILIE AND J. BOUMAN 



much greater than the degree of reduction reported by KHngenberg et al. 

 [9], viz. 1-10*^0 reduced. No doubt, a difference in experimental conditions 

 is responsible for this discrepancy. 



Sarcosomes 



Muscle mitochondria (sarcosomes) have been found to be a much 

 more reproducible source of "extra DPN ". Out of eleven preparations of 



TABLE IX 

 "Extra DPN" in Sarcosomes 

 Unpublished experiments of M. Bailie. Values in /^imoles/g. protein. 



* Determined as in Table VI. 



t Succinate (40 mivi), or succinate (40 mM) + glutamate (30 mM) as substrate. 



X Composition as in Table VIII. 



rabbit-heart sarcosomes, and four of pigeon-breast, only one preparation 

 was found not to contain any "extra DPN" (see Table IX). The amount 

 v^as increased by incubation with succinate in ADP-deficient medium 



