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A. Genetic organization of the devA region. B. Position of Tn4560 in devA following random transposon mutagenesis and positions of the Tn5062 insertions inactivating devA and devB. C. S1 nuclease mapping probe for the devA promoter; 5′ 32P labeling of the probe is indicated by an asterisk. D. Fragments used in complementation experiments.
