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The transcription mechanism of genetic information from DNA to RNA is efficiently controlled by regulatory proteins, such as catabolite activator protein (CAP), and their ligands. When cyclic AMP (cAMP) binds to CAP, the complex forms a dimer and binds specifically to DNA to activate the transcription mechanism. On the other hand, when cyclic GMP (cGMP) binds to CAP, the complex has no marked effect...