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π-A isotherms for CLSE and CLSE/chol 80/20 (mol/mol). The gray shaded area denotes the physiological range of surface pressures that exist in the lungs (Horie and Hildebrandt, 1971; Schürch, 1982). Arrows indicate points at which images were obtained in Fig. 2. Temperature, 22°C; subphase, HSC.
