Ratio of PUFA PC to PC head group.

Note: Mass spectral intensity data was normalized to the PC head group intensity (m/z 184) observed in the spectra resulting from source fragmentation. This can be used to represent the entire PC species in the biological sample. Abbreviations: PUFA, poly-unsaturated fatty acids; PC, phosphitydalcholine lipid; AA, arachidonic acid; EPA, eicosapentaenoic acid; m/z, mass-to-charge ratio.