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TFRs involved in nitrogen metabolism. (A) Homologs of AmtR, a global regulator of nitrogen metabolism in Corynebacterium, may act as local regulators in related organisms. (B) RutR and PydR homologs from separate clades within a larger group of TFRs predicted to be involved in nucleotide metabolism. (C) Homologs of XdhR may be involved in purine metabolism. (Adapted from reference 25.)
