Derivative works of this file: Purini.PNG
571×340 (11,814 bytes) (I drew these chemical structures myself using the chemical drawing program "Chemdraw" March 13th 2007.)
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{{Information |Description=kinds of purine |Source=http://en.wikipedia.org/wiki/Image:Purines.gif |Date=19:06, 13 March 2007 |Author=Andervik |Permission= public domain |other_versions=571×340 (11,814 bytes) (I drew these chemical structures myself using