In a eukaryotic cell, during transcription, RNA splicing, capping and tailing take place inside the

Unlike in prokaryotes where transcription and translation take place in the same compartment, in eukaryotes, primary transcript (hnRNA) is first processed in the nucleus where splicing, capping and tailing of RNA takes place. It is the fully processed hnRNA, now called mRNA, that is transported out of the nucleus for translation.