Fig. 3

Analysis by SDS–PAGE of rOMP28 fusion protein. Lane M, Protein Marker; lane 1, soluble cell proteins of E. coli BL21(DE3) cells with recombinant omp28 before induction; lane 2, soluble cell proteins of E. coli BL21(DE3) cells with recombinant omp28 after autoinduction; lane 3, rOMP28 fusion protein (arrow) purified by affinity purification