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Positive ion mode ESI high-resolution mass spectrometric analysis of crude lipid extracts from the human adenocarcinoma cell lines (A) SW480 and (B) SW620. An internal standard lipid PC(14:0/14:0) was included to enable relative quantification of the observed lipid species, while the internal standard lipids PE(14:0/14:0) and PS(14:0/14:0) (not labeled) were included to allow completion of subsequent reaction with d6-DMBNHS to be monitored.
