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Surface viscosity as a function of surface pressure for the dSP-B1-25 containing films. Increasing the dSP-B1-25 content to 5% only increases the surface viscosity by ∼50%, compared to more than a factor of 5 increase caused by an equal amount of SP-C. Increasing the dSP-B1-25 fraction increases the surface viscosity, suggesting that more fluid phase lipids are removed from the monolayer, consistent with the images in Fig. 7.
