COMPOSITION OF CHROMATOPHORES 473 



TABLE 4. 



Pigments and Electron Transport Components 

 in Chromatium Particles (4,13) 



m/imoles/mg protein 



in photosynthetic electron transport, though the nature of the nonheme 

 iron was obscure at the time. This fact points out the potential value 

 of studying chromatophore composition: the nature of possible unrecog- 

 nized functional chromatophore components can be suggested on purely 

 chemical grounds. With the sophisticated methods of analysis currently 

 available, this area of research should continue to be fruitful to bio- 

 chemists with the patience required to pursue structural work in the 

 absence of any immediate and obvious functional relationships. 



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