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Chromatogram traces of m/z slice 128.0347–128.0360 (128.0353 ± 5 ppm) from extracts of wild type yeast and ykl215c (oxp1) deletion mutant yeast (each with four biological replicates). The replicates of the same strain give similar results, while there is a > 3-fold difference for the features at 7.2 min between the WT and mutant strains (p=0.0005 by T-test). The feature was identified as 5-oxoproline (see text for details).
