Fig. 3

12% SDS-PAGE analysis of fusion protein prokaryotic expression results. M: marker; lane 1, protein stock sample; lane 2, flow-through solution; lane 3, 15 mM imidazole eluent; lane 4, 60 mM imidazole eluent; lanes 5–7, 300 mM imidazole eluent; lane 8, purified protein.