RNA Polymerase II is an essential enzyme responsible for synthesizing messenger RNA (mRNA) from a DNA template during the transcription process. This enzyme plays a crucial role in the expression of protein-coding genes, as it not only initiates transcription but also processes the resulting RNA by adding a 5' cap and a poly-A tail, which are vital for mRNA stability and translation. The proper functioning of RNA Polymerase II is critical for gene regulation and cellular function.
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