211 



Daniel I. Arnon 



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s 



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1 



' f 







it 



^ k ^, 



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Fig. ^. Microphotograph of 

 crystalline f erredoxin-TPN 

 reductase (30) • 



Fig. 6. Microphotograph of 

 crystalline spinach ferre- 

 doxin (9) . 



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\> 



Igep 



Fig. 7. Microphotograph of crystalline Chroma tium ferredoxin 

 (Bachofen, Oda and Arnon, 1963). 



