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. Author manuscript; available in PMC: 2009 Sep 17.
Published in final edited form as: ACS Chem Biol. 2008 Aug 15;3(8):499–511. doi: 10.1021/cb800066p

Figure 2.

Figure 2

Substrates and products of the biosynthesis for: (a) ATP, (b) GTP. Metabolic origin of purine atoms for: (c) adenine, (d) guanine. The substrates and the metabolic source for each purine atom is color coded: Glycine (blue), CO2 (orange), Aspartate (green), Glutamine (red), 10-formyl-THF (cyan)