The remaining regions of the transcript, which include the protein-coding regions, are called exons and are spliced together to produce the mature mRNA.
What fraction of genes are expressed in a typical human cell? Answers: Only 1% of the genes present in the DNA of a cell are expressed.
On average, for each cell line, 39% of the genome is covered by primary transcripts and 22% by processed RNAs. No cell line showed a transcript of more than 56.7% of the junction of the transcriptomes expressed in all cell lines.
The promoter (with or without an enhancer) is the part of the gene that determines when and where it will be expressed. The coding region is the part of the gene that dictates the amino acid sequence of the protein encoded by the gene.
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