300 



F^alvio Perini 



-3 



10 M CN 



fp Lov; O2 tension 



NADH ^ 



acetate — ► and/ or — y and/ or >[--->cyto 55^ — v oxygen 



NADPH fp 



succinate >.fps > >cyto a-605 



oxygen 



-5 

 10 M CN 



Steps indicated by broken lines are hypothetical and have 



not been investigated. 



No siiggestion can be advanced from this research about how or 

 where cytochromes c-552, b-561 and PPNR function in the photo- 

 synthetic apparatus. 



Acknowledgment s 



This investigation has been supported in part by the National 

 Institutes of Health grants and by the C. K. Kettering Foundation. 



The author is gratefiil to Professor M. D, Kamen and 

 Dr. J. Schiff for their valuable help and interest in this work, 



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