purine pyrimidine
![](http://photos1.blogger.com/blogger/4566/894/320/pyrimidine.gif)
![](http://photos1.blogger.com/blogger/4566/894/320/purine.gif)
Adenine and guanine are purines and cytosine, uracil, and thymine are pyrimidines.
Left - purine (smaller molecule with bigger name) and (right) pyrimidine (larger molecule with smaller name)
grey - carbon / white - hydrogen / blue - nitrogen
Labels: adenine, cytosine, guanine, purine, pyrimidine, thymine, uracil
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