PREFACE 



molecules communicate and interact, and how the organism con- 

 trols and adjusts its molecular balance. 



May I express the hope that the reader, after having penetrated 

 into the molecular intimacy of the living being, will be left with the 

 impression that biological order, the foundation of biology, is a 

 fascinating subject. 



Andre Lwoff 

 Paris 

 May, 1960 



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