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Schematic representation of E. coli signal sequence fusion constructs. Amino acid sequences of the signal sequences of E. coli TorA (ssTorA), PhoE (ssPhoE), Hbp (ssHbp) and DsbA (ssDsbA) as fused to a recombinant protein of interest (POI). A universal Ala-Ser-Ala sequence (underlined) for recognition by Signal peptidase I (SPaseI) replaces the three most C-terminal residues of each signal sequence
