Fig. 4.
The product-ion spectra of the [M + Li]+ ions of 16:0/18:2-PE at m/z 722 (A), of 16:0/20:4-PE at m/z 746 (B), of p18:0/18:1-PE at m/z 736 (C), and of a18:0/18:0-PE at m/z 740 (D).
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