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Genes possibly involved in nitrate reductase activity. Schematic diagram of both the narGHJI (A) and narK2X (B) loci in M. tuberculosis. Arrows show the open reading frames with the gene names below the arrows. Relevant restrictions sites are shown: B, BamHI; S, SmaI; E, EcoRV; N, NcoI; K, KpnI. The locations of probes used in Southern blots (hatched boxes) are indicated. The diagram is not drawn to scale.
