The p24 proteins are not essential for vesicular transport in Saccharomyces cerevisiae.
Springer S, Chen E, Duden R, Marzioch M, Rowley A, Hamamoto S, Merchant S, Schekman R.
Proc Natl Acad Sci U S A. 2000 Apr 11;97(8):4034-9. doi: 10.1073/pnas.070044097.PMID: 10737764