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Fig. 1. Transepithelial potential differences (TEPD) of gills of crabs acclimated to low salinity, perfused with different saline concentrations. TEPD of posterior gills increased significantly in absolute value at lower concentrations (P<0.001, N=6 for each gill). TEPD of gill 5 did not differ significantly from 0 mV (P>0.05).