94 



NUCLEIC ACIDS AND NUCLEOPROTEINS 



have in common, namely, the presence in them of an equal num- 

 ber of nucleotides carrying an amino group in 6-position and of 

 those having a 6-keto group. Clearly, if this contention is correct 

 there must exist an agent imposing this regularity on the poly- 



A + U 

 G + C 



40 



Fig. 9. Frequency distribution of various nucleotide ratios in 104 PNA 



analyses, based on the data of Elson and Chargaff^s. The symbols are 



explained in the footnote on page 84. 



TABLE 24 



NUCLEOXroE RATIOS IN PENTOSE NUCLEOPROTEINS 



