The purine structure consists of a pyrimidine ring (positions 1 to 6) fused to an imidazole ring (positions 7 to 9). Adenine and guanine, the two most common purines in DNA and RNA, share this core ...
Inosine is a nucleoside containing hypoxanthine and ribose. It differs from adenosine by the absence of an amino group at the 6 position of the purine ring. (Image: Public domain, via Wikimedia ...
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