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Genetic map of the nrdAB locus. Hatched arrows, nrdAB ORFs; C, conserved NrdA cysteines; Y, conserved NrdB tyrosine; solid lines, DNA fragments used as probes in Northern hybridizations and location of RAP osr4; +1, transcriptional start site of nrdA. Approximate sizes of the mRNAs are shown by the arrows. All of the features are drawn to scale.
