During capping, a 7-methylguanosine residue is attached to the 5-terminal end of the primary transcripts.This is otherwise known as the GTP or 5 cap. The 5 cap is used to increase mRNA stability. Further, the 5 cap is used as an attachment point for ribosomes. Beyond this, the 5' cap has also been shown to have a role in exporting the mature mRNA from the nucleus and into the cytoplasm.