You are interested in examining the Psf gene. It is known that Psf is normally produced when cells are exposed to high levels of both calcium and magnesium. MetA, MetB and MetC are important for binding to the promoter of the Psf gene are involved in regulating its transcription. MetA binds the the A site in the promoter region, MetB to the B site and MetC to the C site. You create binding-site mutations in the A, B and C sites and observe what happens to the transcription of the Psf gene. Your results are summarized in the Table at right.Which of the following proteins are likely to act as gene repressors?

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