How to Cite "Purine and Pyrimidine Structures" from CliffsNotes.com:

CliffsNotes.com. Purine and Pyrimidine Structures. 30 Sep 2014
<http://www.cliffsnotes.com/sciences/biology/biochemistry-ii/purines-and-pyrimidines/purine-and-pyrimidine-structures>.



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