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Effect of short-term (≤24 h) exposure of serum QC pools to elevated temperature (room temperature and 37°C) on concentrations of 5-methylTHF (panel A) and MeFox (panel B). Values are geometric means from 4 replicates/condition. Error bars represent the 95% CI. 5-methylTHF, 5-methyltetrahydrofolate; MeFox, pyrazino-s-triazine derivative of 4α-hydroxy-5-methyltetrahydrofolate; QC, quality control; RT, room temperature.
