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Fig. 4. Transepithelial conductance in isolated half lamellae of gills of seawater-adapted Cancer pagurus, brackish water-adapted Carcinus maenas, and fresh water-adapted Eriocheir sinensis. For the electrophysiological measurements, half lamellae of anterior and posterior gills were mounted in a modified Ussing chamber. Data represent means ± S.E.M. with the number of experiments given in brackets. (From Weihrauch et al., 1999.)