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Pressure-area isotherms of DPPC and DPPC/Re-LPS (XRe-LPS = 0.2) monolayers spread onto a buffered saline subphase containing 150 μM Ca2+ with (solid circles) or without (open circles) 0.08 μg/ml SP-A. The temperature of the subphase was 25°C ± 0.1°C.
