256 



CHAPTER 19 



figure 19-4. Purines. Names oj 

 purines occurring in DNA arc un- 

 derlined. 



Purine 



NH 



NH 



(6-aminopurine) 



Cm NT N 



2-METHYL ADENINE 

 (2-methyl-6-aminopurine) 



CH, 

 N— CH 3 



^N" "N 

 I 

 H 



6-DIMETHYLAMINOPURINE 



GUANINE 

 [2-amino-6-oxy purine) 



N 

 I 

 H H 



2-METHYLAMINO GUANINE 



1 -METHYL GUANINE 



