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SDS-PAGE of proteins used in this study. Lanes: M: molecular mass standards; 1: whole cell lysate of strain X-73; 2: prepurified rOmpH; 3: rOmpH purified by electroelution; 4: rOmpH purified by a hybrid condition of affinity chromatography; and 5: native OmpH of strain X-73 purified by electroelution.
