3. Nascent RNA transcripts from protein-coding genes are called pre-mRNA . They are associated with proteins until they are exported into the cytosol. These proteins and the mRNA are collectively called heterogenous ribonucleoprotein particles (hnRNP).
17. Molecular trafficking between the nucleus and the cytoplasm occurs via nuclear pore complexes (NPCs). The NPCs allow passive diffusion of ions and small molecules. Nuclear proteins, RNAs, and ribonucleoprotein (RNP) particles larger than ~9 nm are selectively and actively transported through NPCs by a signal-mediated and energy-dependent mechanism.
![Steps of mRNA Processing ,[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)