S. S. COHEN 303 



and the DNA synthesized after infection. The newly synthesized DNA 

 greatly exceeded the starting DNA of the bacterial culture. 



With P^2 in the labeled host or labeled medium, the DNA of the virus 

 has been found to be built in the main from the inorganic P of the medium. 

 Ribonucleic acid was not a precursor in the synthesis of this DNA and was 

 essentially inert in infected cells. 



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