Import and export at the nuclear envelope.

Eukaryotic cells transport a myriad of molecules between the nucleus and cytoplasm and have evolved a number of related biochemical pathways to achieve this, many of which have been elucidated in recent years. One central and common component to all the pathways is the NPC. NPC components appear to play vital roles in transport and the NPC is structurally dynamic, but whether its role is as a facilitator, a controller or both is yet to be decided and awaits further analysis on the role of individual components in specific pathways.