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Expression of recombinant proteins analyzed by SDS-PAGE. Lanes 1 and 2, total proteins of E. coli BL21DE3/ pET28a-CstH:LTB induced with IPTG; lanes 3 and 4, un-induced E. coli BL21DE3/pET28a-CstH:LTB gene as control, and lane 5, protein molecular marker
