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Unitary current versus voltage relationships for the VIC channel in the plasma membrane of wheat roots assayed in the presence of (cis:trans): A, 50 mm CaCl2:100 mm NaCl; B, 0.5 mm CaCl2:100 mm KCl (●), 5 mm CaCl2:100 mm KCl (o), or 50 mm CaCl2: 100 mm KCl (▪). Curves were derived from a 3B2S model for cation permeation using the parameters given in Table I.
