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. 2009 Apr;50(4):749–758. doi: 10.1194/jlr.D800056-JLR200

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Fig. 1. — Selected ion chromatograms of major ¹³C-labeled n-3 PUFA isotopomers versus unlabeled endogenous components in plasma at the end of U-[¹³C]α-linolenic acid ([¹³C]α-LNA) infusion. The m/z value of each ion indicated was used to detect the M-pentafluorobenzyl ([M-PFB]⁻) ions of each unlabeled and stable labeled n-3 PUFA, respectively. Depicted are the various isotopomers of (A) α-linolenic acid (α-LNA) (18:3 n-3), (B) eicosapentaenoic acid (EPA) (20:5 n-3), (C) docosapentaenoic acid (DPA) (22:5 n-3), and (D) docosahexaenoic acid (DHA) (22:6 n-3).