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Mass-isotopomer distribution (MID) of M2 and M4 metabolites. MID of M2 (top panel) and M4 (bottom panel) isotopomers was determined by LC-MS and GC-MS after 1-h incubation with [U-13C]glucose. Data shown are mean ± S.D. (n = 3). *, p < 0.05; **, p < 0.01; ***p < 0.001.
