Tomogram of MVB in a bro1Δ cell. bro1Δ cell has class E compartments, which are flattened stacks of endosomal membranes that generally lack internal vesicles. Cisternal class E compartment stacks are shown in different colors to differentiate individual membranes. The vacuolar limiting membrane is labeled red. Scale bar = 100 nm. Frame rate, 50 frames/s.