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Variable-temperature 13C (a) and 1H (b) MAS spectra of PEG-protected DMPC membrane. Asterisks indicate PEG peaks. The DP spectrum at 303 K shows low headgroup intensities, indicating that PEG immobilizes the headgroup above the phase-transition temperature. At 203 K, PEG retains good lipid spectral resolution but does not prevent ice formation.
