Clathrin is produced at the trans end of this organelle, whose most common model states that its cisternae "mature" as they move through it.
Sar1 ("sar one") binds to the membrane of this organelle, and according to a classical model, shuttle vectors move between the "stable" components of this organelle. The somewhat lower pH of this organelle prevents KDEL from acting as a retention sequence, creating a COP-I ("cop one") vesicle leaving this organelle. Clathrin is produced at the trans end of this organelle, whose most common model states that its cisternae "mature" as they move through it. Glycosylation of secreted proteins occurs in this organelle. For 10 points, name this organelle which is responsible for packaging and sorting proteins into vesicles, named for an Italian scientist.
Sar1 ("sar one") binds to the membrane of this organelle, and according to a classical model, shuttle vectors move between the "stable" components of this organelle.
Golgi apparatus [Accept Golgi body or Golgi complex.]