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Diffraction patterns of (A) pure di18:0(9.10Br)PC at 40% < RH < 52%, (B) alamethicin/di18:0(9.10Br)PC P/L = 1:30 at 40% < RH < 55%, and (C) alamethicin/di18:0(9.10Br)PC P/L = 1:20 at 40% < RH < 55%, all at 25°C. The patterns are of rhombohedral symmetry (space group R 
). The dimensions of the unit cells are in (A) c = 5.40 nm, a = 6.96 nm, in (B) and (C) c = 4.95 nm, a = 5.94 nm. The detector images are raw data. The lighter background of (C) was due to a shorter exposure time.
