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termination factor A bacterial protein called rho factor binds to an mRNA at the rut site it moves along the RNA polymerase i
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A bacterial protein called the rho factor binds to an mRNA at the rut site. It moves along the mRNA in a 5' to 3' direction chasing the RNA polymerase. When it reaches the hair pin loop it removes it and proceeds to break the hydrogen bonds holding RNA-DNA together, which successfully removes RNA polymerase.

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