<Tr> <Td> </Td> <Td> This article's lead section does not adequately summarize key points of its contents . Please consider expanding the lead to provide an accessible overview of all important aspects of the article . Please discuss this issue on the article's talk page . (November 2016) </Td> </Tr> <P> Eukaryotic transcription is the elaborate process that eukaryotic cells use to copy genetic information stored in DNA into units of RNA replica . Gene transcription occurs in both eukaryotic and prokaryotic cells . Unlike prokaryotic RNA polymerase that initiates the transcription of all different types of RNA, RNA polymerase in eukaryotes (including humans) comes in three variations, each encoding a different type of gene . A eukaryotic cell has a nucleus that separates the processes of transcription and translation . Eukaryotic transcription occurs within the nucleus where DNA is packaged into nucleosomes and higher order chromatin structures . The complexity of the eukaryotic genome necessitates a great variety and complexity of gene expression control . </P> <P> Transcription is the process of copying genetic information stored in a DNA strand into a transportable complementary strand of RNA . Eukaryotic transcription takes place in the nucleus of the cell and proceeds in three sequential stages: initiation, elongation, and termination . The transcriptional machinery that catalyzes this complex reaction has at its core three multi-subunit RNA polymerases . RNA polymerase I is responsible for transcribing RNA that codes for genes that become structural components of the ribosome . </P> <P> Protein coding genes are transcribed into messenger RNAs (mRNAs) that carry the information from DNA to the site of protein synthesis . Although mRNAs possess great diversity, they are not the most abundant RNA species made in the cell . The so - called non-coding RNAs account for the large majority of the transcriptional output of a cell . These non-coding RNAs perform a variety of important cellular functions . </P>

In a eukaryotic cell which organelle is the site of trancription