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Putative replication region of pSD15. (A) A 5-kb region of pSD15 contains a putative replicase (MS100), helicase (MS102), partition protein (MS101), five iterons, and a 316-bp AT-rich region. (B) The sequence of the five iterons is shown, with the base-pair position on pSD15 indicated in parentheses. Mismatched bases are indicated in boldface.
