The enhancer and promoter regions are both part of the regulatory sequences. The 5′ ends of the transcription initiation site or immediately upstream are where promoter sequences are typically found.
In eukaryotic cells, proteins that bind to particular regulatory regions and modify the activity of RNA polymerase regulate transcription. The enhancer and promoter regions are both present in the regulatory sequences. Every gene has a promoter, which serves as the binding site for RNA polymerase and its co-factors, members of the basic transcriptional apparatus. This offers the bare minimum equipment required to permit gene transcription.
Thus, we can say that both the enhancer and the promoter regions are components of the regulatory sequences, and promoter sequences are often found at the 5′ ends of the transcription start site or closely upstream.
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