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Alignment of a possible incompatibility region within the putative replication origin of coresident pPT23A-like plasmids between bases 291 and 211 upstream of the replicase gene. Arrows indicate inverted repeats that may form stem-loop structures. The putative loop sequence of stem-loop II is variable between coresident (compatible) plasmids. A single nucleotide position, indicated by an asterisk, varies between coresident plasmids.
