22 CHEMICAL SPECIFICITY OF NUCLEIC ACIDS 



sion of inherited properties. It would be gratifying if one could 

 say — but this is for the moment no more than an unfounded 

 speculation — that just as the deoxypentose nucleic acids of the 

 nucleus are species-specific and concerned with the maintenance 

 of the species, the pentose nucleic acids of the cytoplasm are 

 organ-specific and involved in the important task of differen- 

 tiation. 



I should not want to close without thanking my colleagues who 

 have taken part in the work discussed here; they are, in alpha- 

 betical order, Miss R. Doniger, Mrs. C. Green, Dr. B. Magasanik, 

 Dr. E. Vischer, and Dr. S. Zamenhof. 



