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DISCUSSION 



Dr. Siegel: The reference made by Dr. Nitsch to the chemical re- 

 ducing activity of growth factors prompts me to call attention to the 

 generality of this relationship ancl to the manner in which it ties to- 

 gether many points discussed here. The main concept in our paper 

 in this volume is that most organisms must, of necessity, live in an 

 environment which can and does attack continuously their metabo- 

 lites, catalyses, and architecture. 



Oxygen is the only common electron acceptor which can support 

 bioenergetic processes effectively, yet the hazards to life of its aerobic 

 environment have been well documented. Our contribution to this 



