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Variable-temperature 13C (a, c) and 1H (b, d) MAS spectra of DMPC membranes containing trehalose (a, b) and glycerol (c, d). Asterisks indicate cryoprotectant peaks. The trehalose-bound sample showed no linewidth change compared to the control sample in Fig. 2, while the glycerol-bound membrane showed resolution enhancement at 273 K but similar line broadening as the control membrane below 253 K.
