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Comparison of a–c cross-link formation at 10 and 20°C with a series of doubly Cys-substituted membranes. A portion of an immunoblot of a SDS gel run under nonreducing conditions is shown following probing with antiserum to subunit a. The positions of the double Cys substitutions and temperature (10°C or 20°C) of the 1-h CuP cross-linking reaction are indicated.
