Fig. 4

Analysis by SDS–PAGE of rOMP31 fusion protein. Lane M, Protein Marker; lane 1, soluble cell proteins of E. coli BL21(DE3) cells with recombinant omp31 before induction; lane 2, soluble cell proteins of E. coli BL21(DE3) cells with recombinant omp31 after autoinduction; lane 3, rOMP31 fusion protein (arrow) purified by affinity purification