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. Author manuscript; available in PMC: 2010 Feb 10.
Published in final edited form as: J Am Soc Mass Spectrom. 2008 May 10;19(8):1147. doi: 10.1016/j.jasms.2008.04.034

Figure 5.

Figure 5

ESI-TOF mass spectrum of (a) the hydrolysis fragments formed from the 5′-exonuclease digestion of product 4 after 80 min. The inset shows the Y8 fragment formed by the loss of a modified guanine nucleotide (spectrum summed over 3.5 to 7 min retention time); (b) of the hydrolysis fragments formed from the 5′-exonuclease digestion of product 4 after 80 min. The inset shows the Y7 fragment formed by the consecutive losses of a modified guanine (G1) and unmodified guanine (G2) nucleotide (spectrum summed over 2.5 to 3.5 min retention time).