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I perform an experiment to determine the gene regulatory network involving three genes, A, B and...

I perform an experiment to determine the gene regulatory network involving three genes, A, B and C. If I mutate A, I see an overexpression of C. If I mutate B, A is never expressed. What is the regulatory relationship between these genes?

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The relationship among A, B and C has been explained in the image. Please refer to it

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