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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 4.

Figure 4

Molecular structures of compounds synthesized: (1) 13C-C2,8-ATP, (2) U-15N-GTP, (3) U- 13C,15N-GTP, (4) U-13C-GTP. 13C labels are indicated by black circles and 15N labels are indicated by open circles.