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Schematic overview of the sequenced DNA regions upstream of the EcoRI site in the invA gene of strains NCIMB13064, GJ70, and HA1. DNA segments in strain HA1 that differ from the corresponding region in strain NCIMB13064 in about 0 to 1 (X), 10 (Z), or 35% (Y) of their positions are indicated. Open boxes, regions in strains HA1 or GJ70 that show no sequence similarity to the corresponding region in strain NCIMB13064; B, C, and E, BamHI, ClaI, and EcoRI restriction sites, respectively.
