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SDS-PAGE analysis of fraction II stained with Coomassie blue. Lane 1, fraction II (mini-CbpA1-B and EngB-B); lane 2, purified mini-CbpA1 from B. subtilis WB800 (mini-CbpA1-B); lane 3, crude extract from E. coli harboring the engB gene (EngB-E). Lane Std, molecular weight standards (indicated in thousands).
