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Potential stem-and-loop motifs within the SSO (i.e., sti) region of plasmid pIJ101 (A) and the SSO region of pSB24.2 (B). The pIJ101 structure was previously identified (28), while the pSB24.2 structure corresponds to base positions 3330 to 3405 of the published sequence (2). Hexanucleotide sequences that show similarity to the consensus sequence 5′ TAGCGT 3′ found in many SSO determinants (13) are indicated in bold.
