Exocytosis

Exocytosis is a process by which proteins are released from a cell into the extracellular matrix. Newly synthesized proteins are incorporated into transport vesicles within the ER lumen, and these fuse with the cis-golgi. Cisternal migration progressively moves the transport vesicles towards the trans-golgi cisternae. Here, the vesicles move to and fuse with the plasma membrane, releasing the newly synthesized protein.