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Organization of the gtcA genomic region. Arrows indicate the direction of transcription. The solid bar in gtcA indicates the location of the transposon insertion sites (Tn) in M44, B6S, and 27E8. The thick lines indicate the DNA fragments cloned in the indicated plasmids. Numbers indicate sizes of fragments in kilobases. Recognition sites for HindIII (H), Sau3A (S), and EcoRI (E) are indicated.
