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Plasmid-encoded toxin (Pet) and protein involved in colonization (Pic), are serine protease autotransporters of Enterobacteriaceae (SPATEs) secreted by enteroaggregative Escherichia coli (EAEC), which display the GDSGSG sequence or the serine motif. Our research was directed to localize functional sites in both proteins using the phage display method. From a 12mer linear and a 7mer cysteine-constrained...