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. Author manuscript; available in PMC: 2008 Apr 30.
Published in final edited form as: J Am Soc Mass Spectrom. 2007 Mar 23;18(5):898–909. doi: 10.1016/j.jasms.2007.01.017

Fig. 1.

Fig. 1

Representative compound stability traces. The top panel shows PteGlu (folic acid) and the bottom 5-CH3-H4PteGlu (MTHF), whose stabilities were measured in the indicated solvent systems. Each solid square is the average of two independent experiments, with the error bar being ± one standard error of the mean. The data is fit to single-exponential decay function, except when there is no obvious decay (in which case the line is for illustration purposes only).