Transcription (biology)
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Transcription is the process of duplicating a segment of DNA into RNA for the purpose of gene expression. Some segments of DNA are transcribed into RNA molecules that can encode proteins, called messe
Regulation of transcription in mammals. This illustration indicates many of the elements that are present when transcription of a gene is upregulated.
Electron micrograph of transcription of ribosomal RNA. The forming ribosomal RNA strands are visible as branches from the main DNA strand.[citation needed]
Scheme of reverse transcription