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Lipid identification by mass spectrometry. Fragmentation of GM species m/z 1354.8 with a neutral loss of Neu5Ac (−291.1), Neu5Ac + GlcNAc (−494.2), Neu5Ac + GlcNAc + Hex (−656.2), and Neu5Ac + GlcNAc + 2Hex (−818.3) marked in circles. Insets show lipid structures as indicated.
