Figure 4.

(A) Summed IMS-MS spectrum highlighting coordinate regions indicated as important in the developed model. Highlighted coordinates circled in pink are indicative of precursor signals, while those in orange correspond to fragment ions generated by collision-induced dissociation. (B) An extracted ion chromatogram of m/z 309.28 from coordinate (308–310 m/z, 39.5–40 ms) corresponds to the neutral loss fragment of M-HG-X for PC O-18:0/X [M + Na]⁺ where $\mathrm{X}$ is any FA for a representative preeclampsia versus control sample.