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(a) MALDI-TOF mass spectra acquired using the PNA/butyric acid matrix: (a) 16:0/18:1-PG showing [PG + Na]+ at m/z 771 and [PG + 2Na - H]+ at m/z 793, (b) 16:0/18:1-PS displaying [PS + Na]+ at m/z 784 and [PS + 2Na - H]+ at m/z 806, and (c) 16:0/18:1-PA showing [PA + Na]+ at m/z 697 and [PA + 2Na - H]+ at m/z 719.
