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Figure S6.^{Dextranentry kineticsare fluorophore andconcentrationindependent.Averagesof experiments(n = 5) similar to Fig. 3.Calculated(see Supplemental materials and methods) fluxesfor all individual datasetsusing real dextranconcentrationswithoutnormalizationto 2 &microM.Initial cytoplasmic concentrationwas2.90 &microM for Alexa 488 and1.22 &microM for Cy5 25-kDdextran, respectively (see also Table SI in supplemental materials and methods).}