Transcription and mRNA processing occur in the nucleus.
The nucleus is surrounded by a double membrane. After the mature mRNA transcript is produced, it moves out of the nucleus and into the cytoplasm through pores in the nuclear membrane.
antibody Spemann, Hans[egg-tying experiment] [in another context] [transplant experiment] Spermatogenesis S phase of cell cycle Sphenopsids Spinal cord, human Spindle checkpoint Spiracles, insect Spirochetes Spliceosomes[in pre-mRNA processing] ...
Sometimes referred to as interchromatin granule clusters, speckles are rich in splicing snRNPs and other splicing proteins necessary for pre-mRNA processing.
An additional structure of a polymerase CTD (C-terminal domain) phosphopeptide bound by the 3′-RNA processing factor Pcf11 provides insights into the coupling of transcription elongation to mRNA processing.
 See also: Processing, Transcript, Transcription, DNA, Trans
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