In the case of the trp operon, the ligand tryptophan is required for the repressor to work (repressible negative regulation). But other operons respond to the presence of their small molecule ...
Anthony Bellanger, general secretary of the International Federation of Journalists, told VOA that Iran is "a repressor of press freedom," and he urged foreign journalists to be " as cautious as ...
The operon is regulated by Lac repressor, the product of the lacI gene, which is transcribed from its own promoter (PI). The repressor inhibits transcription by binding to the lac operator (O).
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