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Surface pressure (π) versus surface area per molecule (A) isotherm of phosphatidylcholine monolayers: in pure water (1), 2.5 × 10−4 M Li+ ion concentration (2), 2.5 × 10−4 M Na+ ion concentration (3) and 2.5 × 10−4 M Cs+ ion concentration (4) as a subphase
