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Fig. 7. The results of calculations of the ‘channel’ density (squares; N=3; mean + S.E.M.) and the single-‘channel’ current (circles; N=3; mean - S.E.M.) for isolated gill cuticles at a clamp voltage of 50 mV. Values are means ± S.E.M. i, single-‘channel’ current; M, the number of ‘channels’ per cm2.