THE NUCLEIC ACID CONTENT OF TISSUES AND CELLS 11 



The ratio PNA-P/DNA-P is much higher for Uver and pancreas than 

 for other tissues. Tissues with lower PNA-P/DNA-P ratios which still ex- 

 ceed 1.5 are testis, seminal vesicles, and sub-maxillary gland (Tables II and 

 III). It will be noted that the function common to all the above tissues is 

 their active formation of proteins or nucleoproteins, and, since the DNA is 

 confined to the nucleus and the chromosomes, the high PNA-P content 

 would appear to be related in some way to this type of cell activity. This, 

 of course, is the view that was originally developed in the pioneer investi- 



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