Protein enters the rough ER
Protein moves through the ER, assuming a 3D shape
Protein is packaged into transport vesicles, buds off the rough ER
Through endocytosis, the transport vesicle fuses with the Golgi body membrane
Protein is modified, carbohydrate chains are added
Protein is packaged secretory vesicles, buds off Golgi apparatus
Secretory vesicle fuses with the cell membrane
Modified protein is secreted by exocytosis
