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Molecular structures of GPC, GPE, and their membrane phospholipids GPtC and GPtE. Chemical shift of GPC is taken as a reference at 2.80 ppm. Chemical shift differences Δδ(GPtE−GPtC) = 0.56 ppm and (GPC−GPtC) = 0.62 ppm were calculated from high-resolution spectra (spectral resolution <0.02 ppm) by Schiller and Arnold (15), and Δδ(GPE−GPC) = 0.50 ppm from Payne et al. (16).
