A positive regulatory gene has been cloned fromAzotobacter vinelandii, using its ability to activate the expression ofnifH: lacZ fusion inE. coli. The gene has also been shown to activate the transcription from the P1 promoter ofRhizobium meliloti. It did not, however, hybridize with thenifA gene ofR. meliloti.
Volume 100, 2021
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