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Variable-temperature 13C (a, c) and 1H (b, d) MAS spectra of DMPC membranes containing DMSO (a, b) and DMF (c, d). Asterisks indicate the cryoprotectant peaks. The DMSO-bound membrane retains significant liquid water at 203 K and has much narrower headgroup and backbone 13C signals at 203 K than the control membrane. DMF shows slightly weaker beneficial effect than DMSO but the lipid spectra are still better resolved than the control spectra.
