Keywords: Purine-3D-balls.png Ball-and-stick model of the purine molecule a nitrogen heterocycle Many different purine derivatives occur in nature Colour code 505050 Carbon C black<br> F0F0F0 Hydrogen H white<br> 3C50FA Nitrogen N blue<br> 2011-02-10 own DS Visualizer Jynto talk Space-filling version cc-zero Purine Images by Jynto |