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Chromatographic separation of the SPB 18:1(14Z);O2 and SPB 18:1(4E);O2 isomers, resulting from the hydrolysis of complex sphingolipids. SPB 18:1(14Z);O2 is detected in plasma of patients with the p.A280V and p.R311K DEGS1 variants, but absent in the p.G270E variant and unrelated control plasma obtained from 19 individuals (Ctrl 1–19).
