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Passive water transport against an apparent osmotic gradient. The osmolyte accumulation model was used to calculate the oocyte volume as a function of time after presenting an hypertonic (+10 mOsm) bath solution. The parameters used were: Lp = 7 × 10−4 cm⋅s−1, D = 0.5 × 10−6 cm2⋅s−1, and n = 5 osmolytes/αMG transported. From t = 50–100 s, a 2 μA inward cotransport current is applied.
