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SDS-PAGE analysis of purified WT and mutant rP4 proteins. Approximately 10 μg of individual purified rP4 protein was run in each lane of a 10 to 20% SDS-PAGE gel that was stained with Coomassie. Seven of the purified rP4 mutant proteins are shown in this analysis. Lanes: 1, WT rP4; 2, rP4 Q39E; 3, rP4 F48C; 4, rP4 D64E; 5, rP4 D64N; 6, rP4 Y122F; 7, rP4 K161R; 8, rP4 N218Q. Positions of molecular weight standards (masses are in kilodaltons) are shown at the right.
