Fig. 2. Extracted ion chromatograms of the 34 NTPs without labeling (A) or with 8-DMQ labeling (B) followed by LC-ESI-MS/MS analysis. 1, ATP; 2, dATP; 3, GTP; 4, dGTP; 5, CTP; 6, dCTP; 7, UTP; 8, TTP; 9, N6-meATP; 10, 7-meGTP; 11, ITP; 12, XTP; 13, N1-meATP; 14, 2-S-UTP; 15, 5-hmCTP; 16, 5-meCTP; 17, 5-medCTP; 18, 5-hmdCTP; 19, 2′-O-meATP; 20, 2′-O-me-GTP; 21, 5-cadCTP; 22, YTP; 23, 2′-O-me-ITP; 24, 5-meUTP; 25, 2′-O-meCTP; 26, 5-caseUTP; 27, N6-medATP; 28, N4-medCTP; 29, 2′-O-meYTP; 30, 2′-O-meUTP; 31, 5-fodCTP; 32, 5-foCTP; 33, O6-meGTP; and 34, N1-meGTP.
