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(a) Amino acid sequences and disulfide linkages of STh and STp produced by a human and a porcine strain of enterotoxigenic E. coli, respectively. (b) The schematic drawing of STh(6–18). The Cys6, Cys7, Cys10, Cys11, Cys15, and Cys18 residues were represented by C1, C2, C3, C4, C5, and C6, respectively.
