C. >80% of ypt1-1 mutant cells, regardless if they are PEP4PRB1 or pep4∆ prb1∆, accumulate aberrant GFP-Snc1-PEM structures. Hmg1 co-localizes with >70% of these structures, whereas Sec13 co-localizes with only ~15% of these structures (36-43 cells were analyzed for each strain). The experiment was done as described for Panel A. 