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Correlation between apparent permeability (Papp, average of 18 parallels and relative SD) and diffusivities (D) of CAF, ATN, NPR, and HYD in the absence (green diamonds), and presence of mucin (blue squares, 0.1% MUC; yellow circles, 0.3%; red triangles 0.6% MUC). For correlations at MUC 0.3% and 0.6% the data points related to HYD have not been taken into account.
